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No one has _____ been able to trace the author of the poem.

        A. still                           B. yet                           C. already                           D. just

B. yet  


解析:

yet 常用于现在完成时的否定句中, 意为“尚, 还”。

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I was in high school at the time and my sister was too 38 to take part. She wanted to 39 , so she made sixty cookies for us to take and 40 to people. When we got to the homeless shelter we passed out the remaining 41 we had left. Next, we began making sandwiches and pairing them with other goodies(好吃的东西)and 42 them with the crowd. I had the cans with my sister’s cookies in them and began to walk around, offering them to anyone near me.
I 43 an older gentleman and said, “Sir, would you like a 44 ?”He stopped and turned around, 45 ,“What did you say? Did you call me sir?” And I told him I had, and his eyes watered a little bit and he said, “No one has ever called me sir. 46 ”
It  47  me to the core(彻底地).
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40    A    get around           B       get over               C     hand out               D.      hand in
41    A    water                   B       paper                  C     coins                    D       meals
42    A    shared                  B       mixed                 C     threw                   D.      made
43  A    caught                  B       approached          C     limited                 D.      called
44    A    shelter                  B       talk                     C     rest                      D.      cookie
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49    A    reward                 B       honor                  C     gift                      D.      home
50    A    confidence            B       plan                    C     heart                    D.      nervousness
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52    A    learns                   B       deserves              C     leads                    D.      chooses
53    A    still                      B       yet                      C     ever                     D.      just
54    A    generous              B       nice                    C     simple                  D.      political
55    A    decision                 B   choice                  C     difference             D       invention

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