题目内容
从所给的四个选项中选择最佳答案
We're not going to operate on him ______ it is absolutely necessary.
[ ]
A.if B.unless C.as long as D.so far as
答案:B
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题目内容
从所给的四个选项中选择最佳答案
We're not going to operate on him ______ it is absolutely necessary.
[ ]
A.if B.unless C.as long as D.so far as