-- Did you visit the zoo?- No wehave visited it but we spent too much time shopping.A

问题补充：

-- Did you visit the zoo?

--- No, wehave visited it, but we spent too much time shopping.

A. shouldn’t

B. can’t

C. could

D. must

答案：

A. shouldn’t

B. can’t

(答案→)C. could

D. must

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