单项选择题

Jack looked down（）Tom for his poor manners.

A.to
B.at
C.opon
D.in

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单项选择题

After （）his work，he came to help me with my English.

A.finished
B.being finished
C.finishing
D.having been finished

单项选择题

Silver is（）the best conductor.

A.even
B.more
C.very
D.by far

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