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

18、 C

解析：時(shí)間狀語(yǔ)just now指“剛才”， 所以須選過(guò)去進(jìn)行時(shí)態(tài)。

請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
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