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

試題分析:句意為:當我們手邊遇到具體的問題時,這些圖表特別有用。本結(jié)構(gòu)中如果滿足兩個條件時則用主動表被動的形式,一個條件是a concrete problem與solve構(gòu)成了被動關(guān)系,另一個條件是we與solve 之間構(gòu)成了主動關(guān)系,這時候要用主動表被動所以答案應(yīng)為C。而如果是下面這種情況:-----Master, do you have any clothes __________(wash)? -----Yes. 在這一題目中,是仆人為主人洗衣服,雖然any clothes與wash之間構(gòu)成了被動關(guān)系,但不是you去洗,故應(yīng)為被動形式,所以應(yīng)為to be washed.
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