—Why didn’t you pick up the sunglasses?—I it but I didn’t carry that much money.A. could

问题补充：

—Why didn’t you pick up the sunglasses?

—I it, but I didn’t carry that much money.

A. could buy

B. should buy

C. must have bought

D. could have bought

答案：

A. could buy

B. should buy

C. must have bought

(答案→)D. could have bought

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