________ students in the classroom ______ twenty. The others are in the library.
| A．The number of ; is | B．A number of; are |
| C．The number of; are | D．A number of ; is |
________ students in the classroom ______ twenty. The others are in the library.
| A．The number of ; is | B．A number of; are |
| C．The number of; are | D．A number of ; is |
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