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16、—Tony , you look puzzled . Have you understand me ?

—I’m sorry. I        another problem just now .

A.have thought of                                         B.am thinking of

C.had thought of                                           D.was thinking of

16、D

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—Tony , you look puzzled . Have you understand me ?

—I’m sorry. I        another problem just now .

A.have thought of                                         B.am thinking of

C.had thought of                                           D.was thinking of

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