题一： —What caused him to remain on the street last night? —________ there. A. His car’s breaking downB. His car’s break down C. His car’s broken downD. His car breaking down 解析：句意：—什么让他昨天晚上还呆在街上？—他的车在那儿抛锚了。 问题是这个为什么此处His car’s breaking down there后面省略了caused him to remain on the street last night，要用-ing形式作主语、？？？？？？？？？？？
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