--When did you become a volunteer for the elderly?
-- Two years ago. I this group since then.
A. joined
B. took part in
C. have joined
D. have been in
--When did you become a volunteer for the elderly?-- Two years ago. I this group since the
答案:2 悬赏:20 手机版
解决时间 2021-01-04 22:05
- 提问者网友：自食苦果
- 2021-01-04 02:18
最佳答案
- 五星知识达人网友：思契十里
- 2021-01-04 03:52
A. joinedB. took part inC. have joined(答案→)D. have been in解析：有since短语或从句修饰主语通常用完成时，结构为have+过去分词，但在完成时短暂动词不能和时间状语连用，join属于短暂动词，故只能选D。
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- 1楼网友：老鼠爱大米
- 2021-01-04 04:02
就是这个解释
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