I ____in this school since 2001. A: have worked B: has worked C: work D: worked

____ in this field for nearly 10 years, Mark has lots of experience and is fit for the position. A: Having worked B: Worked C: To have worked D: Have worked

I regret __________ hard at school, or I would have passed the exam. A: to have not worked B: having not worked C: not to have worked D: not having worked

________hard before, Tom is afraid of failing in the exam. A: Having been worked B: Not to have worked C: Having never worked D: Never have worked

Joanna was tired. She ____ all day. A: works B: worked C: has worked D: had worked

She____ here for about five years. A: has worked B: worked C: had worked D: works

For past 20 years, she _________ for the company. A: has worked B: have worked C: has been worked

By six o’clock they ______ twelve hours. A: worked B: have worked C: had worked D: will work

Beth( )California in 1981 and( )in Texas ever since. A: has left; worked B: left; has worked C: has left; has worked D: left; worked

Mr. Smith _______with the government for 40 years by the time he retired. A: would have worked B: has worked C: could have worked D: had worked