问题

This is quite a difficult problem and none of us could ____ a solution to it. [ ]

A: come about
B: come out
C: come up to
D: come up with

正确答案是：

同类题型

I can’t find Xiao Ping. Where did you see him this morning?— In the reading room _________ he often studies in.

If we________a table earlier，we wouldn’t be standing here in a queue.

called you this morning,nobodyanswered the phoneWhere______

On the wall _____ two large portraits

The door opened and my mother came in ______ a handbag in her hand.