The expression on his face suggested that he understand what I said.A. puzzling should

问题补充：

The expression on his face suggested that he understand what I said.

A. puzzling, should not

B. puzzled, did not

C. puzzle, was not

D. puzzled, not

答案：

A. puzzling, should not

(答案→)B. puzzled, did not

C. puzzle, was not

D. puzzled, not

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