单项选择题

If you don't know the answer to this question, it is ______ to leave it blank and deal with the other items first.

A．valuable
B．advisable
C．considerable
D．probable
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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
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
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