Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
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A
as if
B
in case
C
while
D
though
推荐题目
 He bought some books, ______ were expensive.
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A
most of which
B
the most of which
C
most  
D
the most of that
The professor said he could talk on _____ interested the audience.
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A
any topic
B
which topic
C
whichever topic
D
the topic he thought it