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
虛擬語氣題。but為暗含的條件相當(dāng)于if we had known the telephone number。 我們本可以打電話給經(jīng)理但是沒人知道號碼。 選A
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