题目内容
What he has learned through practice before _____ him a lot in his future work.
| A.helping | B.helped | C.it helps | D.will help |
D
before这里是副词,不是介词,也不是连词,所填词实际是谓语动词.
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题目内容
| A.helping | B.helped | C.it helps | D.will help |