单项选择题

Among the 15-year-old children, some ______ be studying in university while others are still learning to read and write.

A. should
B. would
C. can
D. must
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My suggestion is that you ______ the meeting next Sunday.
A. held
B. would hold
C. should hold
D. could hold
单项选择题
The more one is ______ the English-speaking environment, the better he or she will learn the language.
A. exposed to
B. filled in
C. caught on
D. kept on
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