单项选择题

It is recommended that the screw ______ to increase accuracy of measurement.

A．is used
B．was used
C．be used
D．had been used
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单项选择题
I was ______ by an unexpected caller that afternoon, so I failed to turn up at the meeting on time.
A．detailed
B．detained
C．detached
D．decayed
单项选择题
She ______ drawing pictures when she was five years old.
A．took to
B．came to
C．looked to
D．went to
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