问题
If the machine makes a mistake — ____ rarely happens– it gives a warning in the form of a red light.
A:that
B:which
C:as
D:what
B:which
C:as
D:what
正确答案是：
同类题型
He would be sure ________ disasters if I didn’t stay to keep an eye on him
__________surprised me most was __________such a little girl of seven could play the violin so well.
rove the quality of our products, weask ____ has used them for suggestions
We should always offer our help to _______ old when they need help in their life.
What he said about my grades_____ me. I’mreally angry with him.