Another problem that needs______is related to teaching.

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问题 Another problem that needs______is related to teaching.

选项 A、discussed
B、to discuss
C、to be discussed
D、being discussed

答案C

解析 这是一道语法题,考点是need后面被动式的用法。need后面被动式有两种形式:need+doing sth.或need to be done结构。
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