None of us understood what the lecturer was______ at.

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问题 None of us understood what the lecturer was______ at.

选项 A、accounting
B、explaining
C、driving
D、working

答案C

解析 drive/get at想说明(……问题),是……意思(注:该短语一般与what连用,并且要用进行时态,如:What on earth are you driving at?I don’t know whether you see what I’m driving at.What was his speech driving at?)。account(for)vi.解释,说明(原因)。explain vt.解释。work at从事于,致力于,学习,研究,设法解决。
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