问题

Global warming has become a serious problem, ______ we must find solutions.

A:which
B:to which
C:with which
D:that

正确答案是：

同类题型

Jack said the paper was too hard when hewas asked why he failed the exam again..— Well, _____.

Must I buy lunch at school—No, you needn’t. You __________ bring your own lunchif you want to.

Jeff’s sister can’t swim _________ dance.

下列各句加点的成语使用错误的一项是

I _______ to bed until my grandma came back home