题目内容
It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
| A.that | B.when | C.which | D.in which |
A
解析
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题目内容
It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
| A.that | B.when | C.which | D.in which |
A
解析