—Do you smoke?—No，I don’t.It’s two years since I __________.A．smokedB．have smo
题型：不详难度：来源：
—Do you smoke?
—No，I don’t.It’s two years since I __________.| A．smoked | | B．have smoked | | C．has smoked | | D．don’t smoke |
|
答案
| A |
解析
| since从句中动词若为延续性动词，则意为“自从不……以来”。 |
举一反三
You can certainly leave the classroom as soon as your homework__________.| A．has done | | B．has been done | | C．will be done | | D．will have been done |
|
—Did you telephone the manager’s office?
—Yes，he__________back before 9 o’clock this morning.| A．expects | B．is expected | C．expected | D．was expected |
|
—Would you like to tell me what our teacher said just now?
—She said that light__________faster than sound.| A．travels | | B．traveled | | C．would travel | | D．was traveling |
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—Has William finished writing his graduation paper yet?
—I don’t know exactly，but he __________all day.| A．is writing | B．has been writing | | C．was writing | D．wrote |
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When you come into the exhibition hall，you can see a large board with a notice on it，saying visitors__________not to touch the exhibits.| A．will request | B．request | | C．are requesting | D．are requested |
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