单项选择题

He came back late, ______ which time all the guests had already left.

A. at

B. after

C. by

D. during

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单项选择题

Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.

A. who
B. that

C. what

D. which

单项选择题

______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A. That the sun and not the earth
B. It is the sun and not the earth
C. Being the sun and not the earth
D. The sun and not the earth

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