My brother and some of his classmates ______ as volunteers to help the elderly in the old-age home during the winter holiday to come.
| A．worked | B．are working |
| C．will be working | D．have been working |
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My brother and some of his classmates ______ as volunteers to help the elderly in the old-age home during the winter holiday to come.
| A．worked | B．are working |
| C．will be working | D．have been working |
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