单项选择题

One of the serious problems facing us is （）of how to get enough manpower.

A.that
B.it
C.which
D.what

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单项选择题
His use of technical terms let his audience （）

A.confusing
B.confused
C.with confusion
D.to confusion
单项选择题
--Im too tired, but lets go. --Why（）rest a while?

A.don' t we
B.not let' s
C.not we
D.let' s not
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