2. 外语
  3. If you want to lose weight, you should not take such food______really necessary.

If you want to lose weight, you should not take such food______really necessary.

admin2013-11-10  71
问题 If you want to lose weight, you should not take such food______really necessary.
选项 A、as is
B、as it is
C、as it was
D、as was
答案A
解析 这里选A，因为as与such常常连用，同时该词又具有关系代词的功能。在本句这个特定的句型里，就非用as is necessary不可了。有时，可以把这个句型看作是从as it is necessary中省略了代词 it 而转变过来的。但是，如果这里就用as it is necessary，虽然符合语法，却不符合习惯用法。因为代词as可以在句子里既引导从句又可以担任从句中的主语。
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