单项选择题

Everyone is busy working. You can't stay here () you keep quiet.

A. when
B. once
C. if
D. unless

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单项选择题
Allen had to call a taxi because the box was () to carry all the way home.

A. much too heavy
B. too much heavy
C. heavy too much
D. too heavy much
单项选择题
I am () short to reach the shelf.

A. enough
B. very
C. too
D. rather
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