The PLA men crossed the Yangtze River ________ April 21,1949．

1. A.
   on
2. B.
   in
3. C.
   at
4. D.
   for

"Chen Gang and Chen Ying are both good Young Pioneers." the PLA

men said ______ one voice.　　　　　　　　　　　　

[　　]

A. in　　B. at　　C. on　　D. with

从A、B、C、D中选出与句中划线部分意义最接近的词语。

As our monitor saw the PLA men clearing the street, he joined them at once.

[　　]

A. Because　　B. Until　　C. When　　D. While