— Can you explain ____ you have been late for school several times this term?
— Sorry, but it is the first time that I have been late this week.
| A．why is it that | B．how it is that | C．why it is that | D．how is it that |
What an unforgettable experience! I'll write it downit is still fresh in my memory．
| A．since | B．while | C．after | D．until |
—Do you think I should accept his invitation，Jim?
—．If I were you．I certainly would．
| A．None of your business． | B．It depends． |
| C．Why not? | D．I don't think so． |
He called to tell me that you are in hospital, otherwise I ______ nothing about it.
| A．had known | B．wouldn’t have known |
| C．would know | D．would have known |
Living in the mountain area has its problems , _____ obtaining water is a big problem.
| A．of which | B．for what | C．as | D．whose |
_______by beautiful green mountains and located at the foot of Lushan Mountain makes it a famous tourist attraction.
| A．Surrounded | B．Being surrounded |
| C．Having been surrounded | D．surrounding |