单项选择题


A．investigate
B．repair
C．explore
D．test
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单项选择题
A．and twoB．or twiceC．or twoD．and twice
A．and two
B．or twice
C．or two
D．and twice
单项选择题
A．will have been waitingB．will have waitedC．shall need waitD．shall have to wait
A．will have been waiting
B．will have waited
C．shall need wait
D．shall have to wait
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