问题

liant idea occurred to him, ___ to his researchin the lab.

A:whiledevoting
B:while devoting himself
C:while he wasdevoted
D:while devoted

正确答案是：

同类题型

The businessman offered a(n) __________ price for one of her collections, giving her a pleasant surprise.

Great changes _____ in my hometown since1980.

I didn’t understand ______, so I raised my hand to ask.

What’s the matter– I have a ________ . I have to go to the doctor.

lesson, or doeseveryone have to learn it