单项选择题

（）he will go to Germany is not decided.

A．Who
B．If
C．That
D．Whether

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填空题
If we (know)（）that the books were available, we would have bought them yesterday.
单项选择题
This dictionary will prove（）to you in your English study.

A．being of some use
B．be of some use
C．to be of some use
D．of some use
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