题目内容
We understand _______small changes to our land can have a big impact upon our environment __________ as we know is vulnerable enough.
A.what; which | B.what; where | C.how; where | D.how; which |
A
解析

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题目内容
We understand _______small changes to our land can have a big impact upon our environment __________ as we know is vulnerable enough.
A.what; which | B.what; where | C.how; where | D.how; which |
A
解析