问题
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
B:what; where
C:how; where
D:how; which
正确答案是：
同类题型
Do you know the Water Cube（水立方）at all? — No, this is the first time I _________ here
I know _________ I promised to take you todinner, but I won’t finish working until ten o’clock.
Jessica, ______ late for school again. — Sorry, I won’t.
The workers in HuaShan Mountains have to rubbish to keep the mountains clean.