单项选择题
A.to be used
B.to have used
C.to have been used
D.to use
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单项选择题
A.inefficientB.effectiveC.efficientD.sufficient
A.inefficient
B.effective
C.efficient
D.sufficient
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单项选择题
A.tracedB.trailedC.twistedD.tested
A.traced
B.trailed
C.twisted
D.tested
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