题目列表(包括答案和解析)
—Has Sam finished his homework today?
—I have no idea. He ________ it this morning.
A. did B. has done C. was doing D. had done
---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A. did B. has done C. was doing D. had done
—Has Sam finished his homework??
—I have no idea. He _____ it this morning.?
A.did?
B.has done?
C.was doing?
D.had done?
—Has Sam finished his homework today?
—I have no idea. He ________ it this morning.
A. did B. has done C. was doing D. had done
— Has Sam finished his homework today ?
— I have no idea. He ______ it this morning.
A. did B. has done C. was doing D. had done
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