问题
选择题
You have failed two tests. You'd better start working har- der,________you won't pass the course. [ ]
A. and
B. so
C. but
D. or
答案
答案：D
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You have failed two tests. You'd better start working har- der,________you won't pass the course. [ ]
A. and
B. so
C. but
D. or
答案：D