【題目】While I down the street, the traffic accident happened.
A.walked
B.was walking
C.is walking

【答案】B
【解析】句意：當(dāng)我在街上走的時(shí)候，交通事故發(fā)生了。首先此句是含時(shí)間狀語(yǔ)從句的主從復(fù)合句．根據(jù)主句the traffic accident happened可知，主句是一般過(guò)去時(shí)態(tài)，從句要用過(guò)去的某一時(shí)態(tài)．又因?yàn)閺木鋡hile引導(dǎo)，表示“當(dāng)…時(shí)”，故用過(guò)去進(jìn)行時(shí)態(tài)；過(guò)去進(jìn)行時(shí)態(tài)的結(jié)構(gòu)為was/were+動(dòng)詞的現(xiàn)在分詞．故選B。

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