【題目】That night Tom drove his car at ________we thought a dangerous speed.

A．a(chǎn)s

B．which

C．what

D．that

【答案】C

【解析】句中Ⅰ thought為插入語(yǔ)，what在賓語(yǔ)從句中作主語(yǔ)。由題干可以看出，speed與介詞at搭配。

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