单项选择题
Automatic machines can only do the jobs they ______ to do.
A．have asked
B．ask
C．have been asked
D．will ask
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单项选择题
My father seldom let me do that, ______.
A．did he
B．did not he
C．does he
D．does not he
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单项选择题
Not until 1959 ______ this compound.
A．that chemists succeeded in obtaining
B．did chemists succeed to obtain
C．chemists succeeded in obtaining
D．did chemists succeed in obtaining
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