-What is your advice?- necessary, you’d better not refer to the dictionary．A.If
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-What is your advice?
-________ necessary, you’d better not refer to the dictionary．
A.If it
B.If it is
C.Unless
D.Unless it
试题答案
C
在本题中，if引导句子前后逻辑不通，应当排除，前面部分补充完整为：Unless it is necessary，省略it is，只有C项合适。