—What _______ the number of the students in your school?
—About two thousand. A number of them _______ from the countryside.
| A．is; are | B．is: is |
| C．are; is | D．are: are |
—What _______ the number of the students in your school?
—About two thousand. A number of them _______ from the countryside.
| A．is; are | B．is: is |
| C．are; is | D．are: are |
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