A laser beam can completely destroy a cancerous growth without () any dangerous cells.

题目
A laser beam can completely destroy a cancerous growth without () any dangerous cells.

A.leaving alone

B.leaving behind

C.leaving out

D.leaving off

参考答案和解析
正确答案:B
解析:leaving alone, 独自呆着;leaving behind,留下;leaving out,遗漏;leaving off,戒除。根据句子的意思,应该是不会留下任何危险的细胞,所以选B. 
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