【单选题】
I don’t think you’ll be able to understand this formula(公式)___ you finish school.
【单选题】
It is ten years ___ I left home.
【单选题】
With the popularity of smartphones, the micro blog __________ a good platform for the young to show themselves gradually.
【单选题】
___ he is poor, he is well contented.
【单选题】
It was ___ it rained heavily that they didn’t come.
【单选题】
1. We cant ___ one to change the habits of a lifetime in a short time.
【单选题】
There were dirty marks on her trousers ___ she had wiped her hands.
【单选题】
EBay, Amazon and WalMart are popular websites ___ people can sell goods to each other.
【单选题】
I hope ___ the little ___ I have been able to do has been of some use.
【单选题】
The hours ___ the children spend in their one-way relationship withtelevision people undoubtedly affect their relationships with real-life people.