检查备胎是否漏气用什么检查？
参考答案：
检查备胎是否漏气，主要是用肥皂水来 检查。
------Hey, Emily, I’ve got a used copy of our chemistry textbook for half price.
------ I’m afraid you ____ your money. Yours is the first edition, but we’re supposed to be using the third edition.
A．had wasted
B．were wasting
C．wasted
D．will waste
天穹及地平圈
