题目内容

She still remermbers the days _____ she spent in the countryside.

A. while
B. that
C. when
D. during which

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

A. which
B. that
C. what
D. who

When people talk about the cities of U.S., the first _____ comes into mind is New York.

A. city
B. of them
C. one
D. that

The book was written in 1946,_____ the education system has witnessed great changes.

A. when
B. during which
C. since when
D. since then

The number of stars that we know _____ is now estimated at about 300 million million million.

A. to exist
B. existed
C. exist
D. exists

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