—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 thoughtC．didn't thinkD．wasn't thinking
C

試題分析：考查時態(tài)。句意：—你在107頁上可以找到這個數(shù)學題的答案。—��！太簡單了！我想知道為什么我就想不起來這個答案呢?根據(jù)句意說明我沒有想起這個答案是過去的事情，故使用一般過去時。故C正確。
點評：英語中的時態(tài)主要由動詞的形式?jīng)Q定，因此在學習英語時態(tài)時，要注意分析動詞形式及具體語境，想象在那個特定的時間動作所發(fā)生的背景，這個動作是經(jīng)常性動作、一般性動作、進行性動作、完成性動作還是將要發(fā)生的動作。
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