_____ three influenza type A virus subtypes(子类型) have been found in pigs.
| A．By far | B．As far as | C．So far | D．Till far |
It was ________he said ________disappointed me.
| A．what；that |
| B．that；that |
| C．what；what |
| D．that；what |
________the news that her beloved mother died in the car accident，tears came into her eyes.
| A．After hearing |
| B．When she heard |
| C．On hearing |
| D．Having heard |
Sam has been appointed ________ manager of the engineering department to take ________place of George.
A. /，/
B．the，/
C the，the
D．/, the
It is your attitude, rather than your aptitude（天资）, ________ determines your altitude．
| A．which | B．that | C．what | D．who |
The birds that will spend the whole winter here have been digging holes in the snow _______ from the cold weather．
| A．to shelter | B．sheltered |
| C．having sheltered | D．sheltering |