单项选择题

The difficulty lies ______ their lack of money.

A) in
B) to
C) on
D) with

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单项选择题

______ , he would have got through the test. A) Had he worked harder C) He had worked harder B) If he have worked harder D) If he worked harder

单项选择题

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

A) providing
B) provide
C) provides
D) provided

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