问题

.He said he _________ experiments those days

A:was doing
B:had been doing
C:has been doing
D:is doing

正确答案是：

同类题型

is the woman—She is our new teacher, Ms. Brown.

the climate, I would stay here much longer

Lucy was _________ excited _________say anything when she heard the good news.

Neil Armstrong is the firstman .

Could you please give me some ___________ I’m hungry.