1) study a) eating b) riding c) waiting d) studying 2) eat a) riding b) playing c) eating d) having 3) sit a) playing b) sitting c) waiting d) having 4) have a) having b) coming c) sitting d) doing 5) wait a) waiting b) sitting c) singing d) having 6) ride a) playing b) studying c) riding d) eating 7) come a) coming b) riding c) sitting d) eating 8) play a) eating b) playing c) sitting d) studying 9) sing a) doing b) singing c) eating d) sitting 10) do a) riding b) doing c) singing d) having

翰林B1 U4：現在分詞

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