问题补充：
－I’d like to help the homeless people in the earthquake.
－You join a volunteer group.
A. must
B. need
C. can
D. couldn’t
答案：
A. must
B. need
(答案→)C. can
D. couldn’t
解析：句意：-我想去帮助地震中无家可归的人。-你可以加入志愿者团体。A must必须B. need 需要在疑问句和否定句中做情态动词C. can能，会，可以D. couldn’t不能。根据句意故选C
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