全口义齿5年最好重新修复，因为
A．基托组织面与黏膜不密合B．全口义齿引起软组织损伤C．全口义齿折断D．全口义齿不美观E．基托树脂老化
参考答案：A
It ________ Jimmyand his classmates about half an hour ________ the classroom.[ ]
A. spends….to clean
B. takes….to clean
C. costs….to clean
D. spends….cleaning
