单项选择题

If a test taker finds an item to which the answer is unknown, it may be ___________ to leave it blank and go on with the test.

A．desirable
B．admirable
C．advisable
D．acceptable
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单项选择题
The union will ___________ the strike now that they have accepted the management's offer.
A．call off
B．call up
C．call out
D．call for
单项选择题
After the discussion it becomes clear that his theory is based on a false ___________.
A．consideration
B．composition
C．supposition
D．acquisition
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