问题
选择题
Clean water and fresh air are essential for our daily life, _______ we can't live.[ ]
A. by which
B. without which
C. that
D. on which
答案
答案：B
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Clean water and fresh air are essential for our daily life, _______ we can't live.[ ]
A. by which
B. without which
C. that
D. on which
答案：B