作业帮单项选择 ( )1.Are you good at A.swim B.swimming C.to swim D.swa
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单项选择 ( )1.Are you good at A.swim B.swimming C.to swim D.swa
单项选择 ( )1.Are you good at A.swim B.swimming C.to swim D.swa
单项选择 ( )1.Are you good at A.swim B.swimming C.to swim D.swa
B
at是介词
B
正确：B （介词at+doing)
swimmming .be good at doing sth
be good at doing sth.擅长做某事
B（介词后加动词ing）