题目内容
It is vital ________ our life that we must ________ our environment.
[ ]
A.to; protect
B.to; harm
C.for; protect
D.for; provide
答案:A
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题目内容
It is vital ________ our life that we must ________ our environment.
A.to; protect
B.to; harm
C.for; protect
D.for; provide