问题
His father often comes back from work at 10 o’clock at night _______ his mother is waiting for him.
A:that
B:when
C:where
D:which
B:when
C:where
D:which
正确答案是：
同类题型
From my point of view, the theory that ______ by the scientist is not quite scientific. [ ]
I don’t think you should use the dictionary while reading newspapers.—, but I can’t do without it.
.Four-fifths of the crop ______
What’s _______most useful invention in the 20th century—________computer, I think.