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We        the manager , but no one        the telephone number .
A.could have called ; knewB.could have called ; had known
C.could call ; had knownD.could call ; knew
A
虚拟语气题。but为暗含的条件相当于if we had known the telephone number。 我们本可以打电话给经理但是没人知道号码。 选A
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