Is this factory __________some foreign friends visited last Friday?

题目

Is this factory __________some foreign friends visited last Friday?
A.that B.where C.which D.the one
这是为什么呢?
还有一题
It was in 1969 _______ the American astronaut succeeded in landing on the moon.
A.that B.which C.when D.in which
这题为什么选A呢？

答案

换成陈述语序
this factory is __________some foreign friends visited last Friday
是定语从句 要填上先行词 The one 然后that省略