单选题
Mary ______ crazy. She burst into laughter now and then for no reason at all.
A) must go C) must have gone
B) may be going D) could have gone
A、
Mary ______ crazy. She burst into laughter now and then for no reason at all.
B、
must go
C、
may be going
D、
must have gone
E、
could have gone
【正确答案】
C
【答案解析】
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