问题

They lived underground, ________ they kept machines ________ so that the Eloi would be happy and well fed.
A:where; running
B:which; to run
C:when; to run
D:what; running;
B:which; to run
C:when; to run
D:what; running;
正确答案是:
同类题型
an we move into our new house now—No, it _________. The decoration has not been finished yet.
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I’ll do it better if the teacher gives me __________________ chance.
The book is superior ________ that one I just finished reading