Everyone knows that _______ is dangerous to play with fire, but _______ is diffi
题型：不详难度：来源：
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.| A．it, it | B．what, what | | C．it, what | D．what, it |
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答案
| C |
解析
| 考查固定句型主语从句。It is+形容词+to do sth.“做某事是......的。”_______ is difficult作主语，主语从句缺少主语，用what。故选C。 |
举一反三
Mr Smith is at the door. _______ wants to see you. |
Someone is at the door. ________ must be Mr Smith. |
He bought three books, _____ is in Chinese, ____ in English, and ____ in Japanese.| A．the first; the other; the third | B．one; the other; a third | | C．one; the other; another | D．one; another; the third |
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Haven’t you got ___ friends in Paris? I feel sure you did mention them once. |
That place is not interesting at all, ____of us wants to go there. | A．Neither | B．Both | C．All | D．Some |
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