国家开放大学 / 综合英语（3）
正确率：100%
A laser beam _ _ _ _ _ _ _ _ on a single cell, on part of a cell, or even individual atoms and molecules.
A.makes enough narrow focus
B. is made enough narrow to focus
C.can be made narrow enough to focus
D. may be made enough narrow to focus
A.makes enough narrow focus
B. is made enough narrow to focus
C.can be made narrow enough to focus
D. may be made enough narrow to focus
参考答案：
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