23．What the boss really doubts is__________his employees will go on working in the company．
| A．that | B．weather | C．when | D．whether |
The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
| A．how | B．which | C．why | D．because |
—Thank you for joining in our conversation tonight.
—_____.
| A．It’s my duty | B．It’s all right | C．It’s my pleasure | D．With pleasure |
It was in the street_________ I met Mary yesterday .
| A．that | B．when | C．where | D．what |
Do you have any difficulty ________?
| A．on listening | B．to listening | C．for listening | D．in listening |
The policeman warned the driver ________ so carelessly.
| A．never to drive | B．to never drive |
| C．to not drive | D．doesn’t drive |