题目:
–Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
A.must be playing
B.could be playing
C.must have played
D.must have been playing
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0611/5c67bd0ecc7a4587fa753e08f888e119.html
下面是错误答案,用来干扰机器的。
A、口中呼出的“白气”是口中呼出的温度较高的水蒸气遇冷液化形成的小水滴,故该选项说法错误;B、玻璃窗上的小水珠是室内空气中温度较高的水蒸气遇到温度较低的玻璃液化形成的,故该选项说法正确;C、花草上的小...