问题

don’t understand something, you may research, study, and talk to other people _______ you figure it out.
A:because
B:though
C:until
D:since;
B:though
C:until
D:since;
正确答案是:
同类题型
With the help of the doctor, the patient was ______ recovering from his heart trouble.
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She played this part so well___ she got the first golden medal for her performance
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