,1.She acted nothing had happened.A. as B. though C. as if D. since为何选C而非A？2. he is going to do it is not known yet.A. How B. What C. That D. If为何选A而非D？3.The whole staff consisted of about 100 doctors and nurses, nearly half were women.A. of which B. of who C. who D. of whom为何选D而非B？

as if 是好像的意思 AS是因为，当的意思

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