单项选择题
A．are
B．to be
C．be.
D．is
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单项选择题
A．constructedB．sentC．anticipatedD．based
A．constructed
B．sent
C．anticipated
D．based
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单项选择题
A．temporarilyB．suddenlyC．permanentlyD．sharply
A．temporarily
B．suddenly
C．permanently
D．sharply
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