Tony ________ for the company as an engineer for two decades. Now he teaches mechanics in Peking University.
| A．has worked | B．worked | C．is working | D．had worked |
相关试题
The music sounded， the end of the class．
| A．indicating | B．indicated | C．to indicate | D．indicate |
Carbon
dioxidefrom burning fuels is the most common of the so-called greenhouse gases.
| A．produced | B．producing | C．to be produced | D．having been produced |
Staring at the priceless diamond amazement, Mary dreamt of getting one．
| A．with | B．by | C．at | D．in |
Tomwith his grandmother for eight years，but now he is living by himself.
| A．lives | B．1ived | C．has lived | D．has been living |
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