单项选择题
It has something （） with poor workmanship and assembly, doesn’t it?
A.do B.to do C.done D.doing
单项选择题 The certificate for the refrigerating plant will（）soonI’d like to extend its validation now.
单项选择题 （）, remedies must be taken to stop it as early as possible.
单项选择题 （）, the motion would continue indefinitely once it had started.
