原题:
题型:单项选择-四个选项
Ben knows a lot about science. He often ________ small things for his classmates.
| A.fix | B.fixing | C.to fix | D.fixes |
题目考点:动词时态与主谓一致
| A.fix | B.fixing | C.to fix | D.fixes |
题目考点:动词时态与主谓一致
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