-Can you describe__it happened?-Yes,I was walking on the street__I saw a car knocked an old ladydown from behind.A.when;as B.how;as C.how;when D.how;while
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-Canyoudescribe__ithappened?-Yes,Iwaswalkingonthestreet__Isawacarknockedanoldladydownfrombehind.A.wh
-Can you describe__it happened?-Yes,I was walking on the street__I saw a car knocked an old ladydown from behind.A.when;as B.how;as C.how;when D.how;while
-Can you describe__it happened?-Yes,I was walking on the street__I saw a car knocked an old lady
down from behind.A.when;as B.how;as C.how;when D.how;while
-Can you describe__it happened?-Yes,I was walking on the street__I saw a car knocked an old ladydown from behind.A.when;as B.how;as C.how;when D.how;while
选C~
选C啊
翻译：——你能描述一下它是怎么发生的吗？
——好的，当我正在街上走看见一辆车撞倒了一位女士。
不选D是因为while连接两个现在进行时句子
希望有帮到你~