单项选择题

(A) container (weighs) more after air (is put) in, (it) proves that air has weight.

A．A
B．weight
C．is put
D．it
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There is so much work ______ today. Would you be kind enough to lend me a hand
A．having done
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He changed his name, ______ that nobody would find out what he had done before.
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