.――Oh what a pity! All the tickets were sold out.――I'm sure we two but you were not quic

问题补充：

.

――Oh, what a pity! All the tickets were sold out.

――Im sure we two, but you were not quick enough.

A. could buy

B. had bought

C. would buy

D. could have bought

答案：

A. could buy

B. had bought

C. would buy

(答案→)D. could have bought

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