—I expected him to be nervous before his speech but he was as cool as a cucumber. —He it

问题补充：

—I expected him to be nervous before his speech, but he was as cool as a cucumber.

—He it carefully.

A. could have prepared

B. shouldn’t have prepared

C. must have prepared

D. can’t have prepared

答案：

A. could have prepared

B. shouldn’t have prepared

(答案→)C. must have prepared

D. can’t have prepared

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