These diagrams are especially helpful when we have a concrete problem ______ at hand.


  1. A.
    be solved
  2. B.
    to solve
  3. C.
    solved
  4. D.
    being solved
B
試題分析：句意為：當(dāng)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.
考點(diǎn)：考查非謂語動詞的用法。
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