单项选择题
If the test taker finds an item to which an answer is not known, it may be
wise
to leave it blank and go on with the test.
A．valuable
B．advisable
C．considerable
D．probable
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单项选择题
I can't make it because of a previous engagement.
A．primary
B．prior
C．temporal
D．primitive
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单项选择题
The disease was kept under control owing to early diagnosis and treatment.
A．on virtue with
B．for virtue of
C．by virtue of
D．in virtue with
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A．whoB．whichC．whatD．where