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

解析本句是强调句型，强调时间状语。

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