The number of students in this school has ______ since 2008.A.had doubled B.has doubled C.doubled D.double

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The number of students in this school has ______ since 2008.A.had doubled B.has doubled C.doubled D.double
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The number of students in this school has ______ since 2008.A.had doubled B.has doubled C.doubled D.double
The number of students in this school has ______ since 2008.
A.had doubled B.has doubled C.doubled D.double

The number of students in this school has ______ since 2008.A.had doubled B.has doubled C.doubled D.double
B 时态应为现在完成时

The number of students in this school has __increased____ since 2008
自从2008年我们学校的学生人数增加了
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问题补充:
这里选择B,因为后面有since,选用完成时,另外是自从2008年以来,所以是现在完成时,选择B