问题描述：
-What are you doing this summer vacation?-I am_ A.going bike riding B.going bike ride C.g...
-What are you doing this summer vacation?
-I am_
A.going bike riding B.going bike ride
C.go riding bike D.go bike riding
-What are you doing this summer vacation?
-I am_
A.going bike riding B.going bike ride
C.go riding bike D.go bike riding
问题解答：
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