It was in the winter of 1951__a heavy fog moved into London.A.thatB.thenC.whenD./
It was in the winter of 1951__a heavy fog moved into London.
A.that
B.then
C.when
D./
B.then
C.when
D./
参考解析
解析：本句是一个强调句。强调句的结构是：It is（was）+被强调部分+that（who）+句子的其他部分。只有当被强调部分在句子中作主语，且表示“人”时，才用who。
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