单项选择题

The professor recommends that we ______ tile experiment until it is carefully designed.

A．don't start
B．not start
C．will not start
D．are not to start
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单项选择题
______ that they may eventually reduce the amount of labour needed on construction sites by 90 per cent.
A．Such construction robots are clever
B．So clever the construction robots are
C．Such clever construction robots are
D．So clever are the construction robots
单项选择题
It's harmful to one's health to ______ smoking and drinking.
A．take on
B．take to
C．take in
D．take off
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