单选题
What ______ to Tom yesterday?
A、
[A] happened
B、
[B] has happened
C、
[C] was happened
【正确答案】
A
【答案解析】
what happened to sb．固定用法，某某怎么了?这句问话中有过去时态的标志词"yesterday"所以B被排除了。
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