_ in 1943 _ the harmful smog made its appearance in Los Angeles.A、Only..

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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

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_____ in 1943 _____ the harmful smog made its appearance in Los Angeles.A、Only..