单项选择 适中0.65 引用2 组卷185
So far, the number of people using 5G smartphones ________ a lot.
A.is increasing | B.are increasing | C.has increased | D.have increased |
2021·甘肃白银·一模
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A number of birdwatchers ________ in Zhalong Nature Reserve. The number of them ________ 500.
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Look! There _______ a number of students running on the playground. The number of them _________ 15.
A.is; is | B.is; are |
C.are; is | D.are; are |
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