1.It was in 1969 _______ the American astronaut succeeded in

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1.It was in 1969 _______ the American astronaut succeeded in landing on the moon.A.that B.which
1.It was in 1969 _______ the American astronaut succeeded in landing on the moon.
A.that B.which C.when D.in which
2It was 1969 _______ the American astronaut succeeded in landing on the moon.
A.that B.which C.when D.in which 多选

1.A（强调句~）
It was in 1969 that the American astronaut succeeded in landing on the moon
原句是 The American astronaut succeeded in landing on the moon in 1969.（强调时间~）
强调句的一般句式就是 it is/was ……that……
2.CD
It was 1969 when/in which the American astronaut succeeded in landing on the moon
如果把1969放回末尾~会发现少了介词 in~这时候就要用 when（此时when=in which）
以此类推~（where=in which 有时候会相等~）
希望帮到楼主~

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