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

That is a watch of ____ .

Why not take_______ umbrella with the sign "Madein china" It is_______ useful one.

_______ are you staying there –– For about two weeks.

— Do you have the time— Yes. But… my watch is not very __________.

Is your job a cook, Alen —Yes, _______.