问题

_______, I lost heart in English learning, but my teacher often said to me, “Keep on working hard andyou’ll succeed “.[ ]
A: At a time, in time
B: At a time, on time
C: At one time, in time
D: At one time, on time
B: At a time, on time
C: At one time, in time
D: At one time, on time
正确答案是:
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