when+【V-ing】=when+主语+V语境时态,典型地省略相同逻辑主语.
when receiving=when you receive（前面有should,这里用一般现在时态）
you should say thank you when receiving something
you should say thank you when receiving something
you should say thank you when （ ）something
A.receive B.you received C.to receive D.receiving
when+分词构成的省略结构是什么?这题要是换一种答案是什么
you should say thank you when （ ）something
A.receive B.you received C.to receive D.receiving
when+分词构成的省略结构是什么?这题要是换一种答案是什么
英语人气：829 ℃时间：2020-02-05 10:28:51
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