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—She must have gone back to the valley. 
—No, she_________. The entrance to it was nowhere to be found.
A.mustn’tB.needn’tC.couldn’tD.may not
C
词义辨析题。  A. mustn’t 禁止 B. needn’t 不必  C. couldn’t 不可能 D. may not 也许不 句意:她一定回到山谷了。不可能,进入山谷的路口找不到。根据语境选C
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