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—You may find the key to the math problem on page 107．
—Ah, it's so simple． I wonder why I _       of that．
A．hadn't thoughtB．haven't thought
C．didn't thinkD．wasn't thinking
C

試題分析：考查時態(tài)：句意：--你可以在107頁找到數(shù)學(xué)問題的答案。--哦，是這么簡單，我當時沒想到這句應(yīng)該用過去式，A表示過去的過去B表示到現(xiàn)在沒想到，D是過去沒有在想。選C。
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