They often ____ basketball after school.
A. playing
B. played
C. play
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大学生创业团队往往在后期难以坚持的原因是()。
A. 各忙各的
B. 意见不一致
C. 缺乏契约精神
D. 骄傲自满
E. 缺乏领导人
Right now he _____ on a pair of jeans.
A. is trying
B. tries
C. has tried
乳牙是婴幼儿重要的咀嚼器官,可以帮助消化,促进骨发育。()
A. 对
B. 错