The choir 是指合唱團a)practice 練習(現在式 第一二人稱)b)practices 練習...個答案不可以 是因為意思不同而且＿ｔｏ ｐｒａｃｔｉｓｅ前面要是動詞才可以的！！ｏｋ ︿︿
...school and comic clubs in the university I joined in. In the choir, I always practiced singing after getting out of the class, and had contest with other...
... [and had been] a member of [a] choir. It sounds strange,doesn't it[?] ...the song "Forty"] this time[, and I practiced it [for] a long time.When I stood...