By the middle of the 21st century, the vast majority of the world’s population _____ in cities rather than in the country.
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A
are living
B
will be living
C
have lived
D
will have lived
推荐题目
---The president _____ by his doctor today that his cancer has come back.
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A
informs
B
has informed
C
has been informed
D
is being informed
 —Can I join the club, Dad?—You can when you _____ a bit older.
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A
get
B
will get
C
are getting
D
will have got