2. 外语
  3. In addition, teaching staff is willing to extra help if a student needs.

In addition, teaching staff is willing to extra help if a student needs.

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问题 In addition, teaching staff is willing to      extra help if a student needs.
选项 A、providing
B、provide
C、provides
D、provided
答案B
解析 在be willing to短语中，to是不定式的标志，其后应该跟动词原形。be willing to do sth.是“愿意/乐意做某事”的意思。这种用法的to有很多，如be likely/happy to do sth.。
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