Nobody knows ______ yesterday.
A．how the accident happens
B．how does the accident happen
C．how the accident happened
D．how did the accident happen
C

試題分析：句意：沒有人知道昨天的事故是怎么發(fā)生的，賓語從句的結(jié)構(gòu)：主語+謂語+連接詞+從句。從句在句中作賓語。從句要用陳述句的語序。如果主句是一般現(xiàn)在時(shí)，從句根據(jù)需要選擇時(shí)態(tài)，如果主句是過去時(shí)態(tài)，從句要用相應(yīng)的過去時(shí)態(tài)。但是從句是客觀真理，一般用一般現(xiàn)在時(shí)態(tài)。根據(jù)時(shí)間狀語yesterday.故用過去時(shí)態(tài)，BD語序錯(cuò)誤，故選C。
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