单项选择题

If the test taker finds an item to which an answer is not known, it may be ______ to leave it blank and go on with the test.

A．probable
B．considerable
C．advisable
D．preferable
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单项选择题
Cranes are used to ______ building materials to the upper floors during the construction of skyscrapers.
A．hoist
B．tow
C．hurl
D．toss
单项选择题
The man's ______ directions confused us, we did not know which of the two roads to take.
A．complicated
B．arbitrary
C．ambiguous
D．intricate
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