If you choose not to receive those emails, please let us know by (send)______us a message.

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问题 If you choose not to receive those emails, please let us know by (send)______us a message.

选项

答案sending

解析 分析句子结构可知,空格前的by是介词,后面可以接名词或动名词,充当宾语。本句中by后面需要接动名词,所以空格处填入send对应的动名词形式sending。
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