The boy has taken a course to learn all about ___(sail)是不是填sailing?
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Theboyhastakenacoursetolearnallabout___(sail)是不是填sailing?Theboyhastakenacoursetolearnallabout___(sai
The boy has taken a course to learn all about ___(sail)是不是填sailing?
The boy has taken a course to learn all about ___(sail)是不是填sailing?
The boy has taken a course to learn all about ___(sail)是不是填sailing?
是,介词后的动词用ING
不是吧，我觉得应该填原型，在这里sail是名词。