【題目】I'm ________ sure ________ computers can work in our heads well.
A./; whether
B.not; that
C.not; if
D.quite; whether

【答案】C
【解析】句意是：我不確定電腦是否能很好地配合我們的大腦。本句是 if 引導(dǎo)的賓語從句，故選C。

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