问题

I’m glad you’ve made great progress so farKeep it up______ you must be successful
A:and
B:while
C:so
D:or
B:while
C:so
D:or
正确答案是:
同类题型
____ he works hard, I don’t mind when he finishes theexperiment.
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The notice came around two in the afternoon ____the meeting would be postponed.
We’re playingreally well this season.We believe we will win!—______