Nobody can explain the mystery ____ he suddenly disappeared.
| A．why | B．what | C．whether | D．which |
_________ pleased me was that there was my purse, in the back seat of the taxi, _____ the driver couldn’ t possibly see it before.
| A．That ; that | B．Which ; which |
| C．What ; where | D．How ; when |
As a matter of fact , this sofa is now an antique which served ______ a bed in the past .
| A．as | B．for | C．to | D．with |
---The excellent student is said ________in Germany last year .
--- No wonder he has a good command of German .
| A．to study | B．to be studying |
| C．to have studied | D．studied |
----_______an earthquake happens in Quanzhou when we are having a lesson ?
---- I’m afraid most of us will be trapped.
| A．If only | B．What if | C．As if | D．Even if |
Think twice and time will _____what you have chosen is right or not .
| A．know | B．say | C．see | D．tell |