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
Someone broke into the house and stole many paintings. It was a long time ______ the housekeeper discovered what had happened.
A．until
B．when
C．since
D．before
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
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