单项选择题

Bob won't stop trying ______ he gets what he wants.

A．
[A] as

B．
[B] that

C．
[C] till

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单项选择题
______ the end of last year they had planted 4,000 trees.
A．
[A] At

B．
[B] By

C．
[C] To
单项选择题
Sometimes we can see ______ stars in the sky at night.
A．
[A] thousand of

B．
[B] thousands of

C．
[C] thousand
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