Half of the class ______ done most of the work. The left ______ rather difficult.
| A．has, is | B．have, is |
| C．have, are | D．has, are |
Half of the class ______ done most of the work. The left ______ rather difficult.
| A．has, is | B．have, is |
| C．have, are | D．has, are |
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