______ the students in our class is 50 and _______ them study very hard.
| A．The number of; the number of | B．A number of ; the number of |
| C．The number of; a number of | D．A number of; a umber of |
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______ the students in our class is 50 and _______ them study very hard.
| A．The number of; the number of | B．A number of ; the number of |
| C．The number of; a number of | D．A number of; a umber of |
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