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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大学英语三级A级

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