33．Just as I was sitting down to supper the telephone.A. must ringB. might have rungC. wo

问题补充：

33．Just as I was sitting down to supper, the telephone.

A. must ring

B. might have rung

C. would ring

D. would have rung

答案：

(答案→)A. must ring

B. might have rung

C. would ring

D. would have rung

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