Hardly had Professor Wilson finished his speech______the audience started cheering.
A、
since
B、
than
C、
when
D、
as
【正确答案】
C
【答案解析】
解析：句意：威尔逊教授刚结束他的演讲，听众们便开始欢呼。Hardly…when…为固定搭配，意为“刚一……就……”。故选C。
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