单项选择题

It was the first time that he () his composition in 30 minutes.

A.finished
B.finish
C.have finished
D.had finished

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It's a pity that Professor Smith has failed to make his idea () in the classroom.

A.understanding
B.to be understood
C.understood
D.to understand
单项选择题
() is known to the world, Mark Twain is a great American writer.

A.That
B.Which
C.It
D.As
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