---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
A．didn’t think B．haven’t thoughtC．wasn’t thinkingD．hadn’t thought
A
考查時(shí)態(tài).根據(jù)題意,在107頁你能找到答題的關(guān)鍵.——啊，這么簡(jiǎn)單。我想知道我為什么沒有想到那點(diǎn)�？芍獜木湔f的是過去發(fā)生的事情。I是 從句主語，用主動(dòng)語態(tài)過去時(shí)態(tài)，選A。
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