【題目】Nobody knows ______ yesterday.

A. how the accident happened

B. how does the accident happen

C. how the accident happens

D. how did the accident happen

【答案】A

【解析】

句意：沒(méi)有人知道昨天事故是如何發(fā)生的。根據(jù)yesterday可知此處用一般過(guò)去時(shí)，故排除BC兩項(xiàng)。作為動(dòng)詞knows的賓語(yǔ)從句，故用陳述語(yǔ)序：疑問(wèn)詞+主語(yǔ)+謂語(yǔ)+賓語(yǔ)，故選A。

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