问题

ee, I’m poor in physics and you arenot good at chemistry, and……— That’s _______ we should help each other

A:am working
B:had been working
C:have been working
D:was working

正确答案是：

同类题型

The edition of Longman Dictionary is up to date. The words which _____ into English from the outside world ______ about 200 pages of the dictionary.

I ____my school ID card at home. May I go home and get it

Whose is that book—-It _________ belong to Lucy. Her name is on it.

下列句子中，没有语病的一项是（）

Neither Tom nor his parents ________ at home.