I have not heard from him since I ___ to Singapore. A have returned B was returning C returned
I have not heard from him since I ___ to Singapore. A have returned B was returning C returned
英语人气:179 ℃时间:2020-04-11 07:18:44
优质解答
since 表示自某一点时间以来,常用完成时态或完成进行时态,表示动作的延续或频率.所以选C
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