一、单选题共20题，100分
1
5分
He_____the problem_____in his mind for a whole week before he did anything about it.
Aswitched, on.
Bkicked, up.
Cturned, over.
Dtook, on.
学生答案：C
2
5分
—Would you like to join us in playing the football game? —I’m sorry, but my homework_____by now.
Ahasn’t finished
Bhasn’t been finished