单选题
When he woke up, he realized that the things he had in his dream could not______ have happened.
A、
certainly
B、
likely
C、
possibly
D、
potentially
【正确答案】
C
【答案解析】
解析：possibly ad. 可能，也许。certainly ad. 必定，一定；(回答别人的请求)当然，可以。likely ad.很可能。potentially ad.从潜在可能性看。
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