题目内容
18、―Tom, you look puzzled. Do you understand it?
―Yes. I __________ another problem just now.
A. have thought of B. had thought of
C. was thinking of D. am thinking of
试题答案
18、 C
解析：时间状语just now指“刚才”， 所以须选过去进行时态。
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―Tom, you look puzzled. Do you understand it?
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A. have thought of B. had thought of
C. was thinking of D. am thinking of
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