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问题: As he didn't.....

As he didn't want_____sad,he pretended to be cheerful.
A.to be sounded
B.sounding
C.to sound
D.being sounded

解答:

原句的意思是他不想让别人听出自己太悲伤.所以应该用被动语态.又因为want后面跟不定句,所以选A