问题

（2010·重庆模拟）—Alice, you look puzzled．Haven’t you understood it? —Yes．I _____of another problem just now

A:had thought
B:have thought
C:thought
D:was thinking

正确答案是：

同类题型

______ from the space, the earth, with water _______ seventy percent of its surface, looks like a blue ball.

What colour do you think you feel calm

The footbD. valued

With trees and grass__________39.6% of the urban area，the city has taken on a new look.

I don’t think difficult for a Chinesestudent to master a foreign language within five years