题目内容
---_____must I take this medicine every day?
--- Three times a day.
| A.How long | B.How often | C.How far | D.How |
B
解析
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题目内容
---_____must I take this medicine every day?
--- Three times a day.
| A.How long | B.How often | C.How far | D.How |
B
解析