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These diagrams are especially helpful when we have a concrete problem ______ at hand.
A.be solvedB.to solveC.solvedD.being solved
B

试题分析:句意为:当我们手边遇到具体的问题时,这些图表特别有用。本结构中如果满足两个条件时则用主动表被动的形式,一个条件是a concrete problem与solve构成了被动关系,另一个条件是we与solve 之间构成了主动关系,这时候要用主动表被动所以答案应为C。而如果是下面这种情况:-----Master, do you have any clothes __________(wash)? -----Yes. 在这一题目中,是仆人为主人洗衣服,虽然any clothes与wash之间构成了被动关系,但不是you去洗,故应为被动形式,所以应为to be washed.
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