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

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

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

答案 D

解析若将only放句首，句子主谓要到装，所以A项错。该句应用强调句型，结构为“It is(was)+被强调部分 +that(who/whom)+句子其他部分”。

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