Students______ to do some voluntary work every year.

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问题 Students______ to do some voluntary work every year.

选项 A、were encouraged
B、are encouraged
C、encourage
D、encouraged

答案B

解析 encourage sb．to do sth．，意为“鼓励某人做某事”。students与encourage之间存在被动关系，需要被动语态；由时间状语every year可知，需用一般现在体。答案为B。

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