单项选择题

（）is no doubt that he will come here some day，but （）is doubtful when he will come.

A.There；there
B.It；it
C.There；it
D.It；there

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单项选择题

There isn’t much work（）by them.

A.to do
B.to be done
C.being done
D.which to be done

单项选择题

Mr.Herre is the one of many experts（）in our factory.

A.that are
B.that is
C.which are
D.which is

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