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單項選擇題

The professor said he could talk on （）interested the audience．

A.any topic
B.which topic
C.whichever topic
D.the topic he thought it

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單項選擇題

You （）him so closely; you should have kept your distance．

A.shouldn’tfollow
B.mustn’tfollow
C.couldn’t have been following
D.shouldn’t have been following

單項選擇題

It （）quite a few years （）the accused was declared innocent and set free．

A.was；since
B.is；that
C.will be；when
D.was；before