He got up late and hurried to his office, _______ the breakfast untouched.
| A．left | B．to leave | C．leaving | D．having left |
You can’t complain of being lonelyyou don’t make any effort to meet people．
| A．until | B．when | C．once | D．though |
Opening the door, Mrs．Summers foundfamily ofcats shut in the bathroom．
| A．a; 不填 | B．a; the | C．the; 不填 | D．the; the |
Wethe top of the mountain but for this awful weather．It rained all day．
| A．will reach | B．would reach | C．have reached | D．would have reached |
we go there by train or by ship makes no difference．The time and the fees are the same．
| A．Which | B．How | C．Whether | D．Why |
their final medical check, the astronauts boarded their spacecraft．
| A．Received | B．Being received | C．To receive | D．Having received |