We must take measures to stop various kinds of pollution ______ the environment gets worse.
[ ]
A. unless B. until C. before D. when
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— Can you tell me how to learn English well? — Do more spea..
— Can you tell me how to learn English well? — Do more speaking, I think, ______ you will not be good at spoken English. [ ]A. then B. andC. or D. until
One reason for Mary's preference for this senior high schoo..
One reason for Mary's preference for this senior high school is _____ she can have access to outstandingteachers and plentiful learning resources. [ ]A. whyB. howC. whatD. that