单项选择题

How many more decades will have to pass_____scientists succeed in providing a cure for cancer？

A．when
B．before
C．since
D．until
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问答题
A (A)container weighs (B) more after air is put in (C), it (D) proves that air has weight.
单项选择题
There is so much work _____today Would you be kind enough to lend me a hand？
A．having done
B．to be done
C．being done
D．will be done
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