The number of the workers here ___ 200. Half of them ____under 30 years old.
| A．are, are | B．is, are | C．are, is | D．is, is |
The number of the workers here ___ 200. Half of them ____under 30 years old.
| A．are, are | B．is, are | C．are, is | D．is, is |
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