问题
选择题
____ in1943 _____ the harmful smog made its appearance in Los Angeles. [ ]
A. Only; that
B. It was;then
C. That is was; when
D. It was; that
答案
答案：D
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____ in1943 _____ the harmful smog made its appearance in Los Angeles. [ ]
A. Only; that
B. It was;then
C. That is was; when
D. It was; that
答案：D