问题

We ________ on this project for four hours. Let’s have a rest.[ ]

A: are working
B: have been working
C: worked
D: had worked

正确答案是：

同类题型

Are there ________ televisions inthe room

“________ give up (放弃), then you can be successful.”

In Scandinavian countries it is common ____ for thehusband to stay at home to look after the baby.

从词类活用的角度看，下面加横线字归类正确的一项是（）①臣不胜犬马怖惧之情 ②衣赭衣，关三木 ③乳二世，先妣抚之甚厚④襟三江而带五湖 ⑤吾妻死之年所手植也 ⑥而后乃今将图南⑦故述往事，思来者 ⑧屈贾谊于长沙 ⑨曼辞以自饰

It won’t be too long before we_____a way to smooth away these difficulties