in 1943 the harmful smog made its appearance in Los Angeles.

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问题 ______ in 1943______ the harmful smog made its appearance in Los Angeles.

选项 A、Only... that
B、It was... then
C、That it was ... when
D、It was ... that

答案D

解析考点为句子结构。这应是强调句型，因为即使不填入It was... that，整个句子结构也是完整的。同样的例于还有：It’s you that are in danger. (是你有危险。)It’s when he’s out of work that he’s so violent. (只是在他失业的时候，他才这么狂暴。)

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本试题收录于：大学英语三级A级题库大学英语三级分类