We __________ 1000 English words since we __________ to learn English.A．learned;
题型：不详难度：来源：
We __________ 1000 English words since we __________ to learn English.| A．learned; begin | B．have learning; began | | C．have learn; begun | D．have been learning; began |
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答案
| D |
解析
| since 引导的时间状语从句中，当从句中用since+表示一般过去时时，主句要用现在 完成进行时或现在完成进行时，（动词必须是延续性动词）故选D |
举一反三
—What were you doing when the UFO arrived?— I with my dog on the street.| A．walked | B．was walking | C．is walking | D．have walked |
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—What will Jack do on vacation?
— He’ll go to Disneyland if he _________ enough time. | A．will have | B．had | C．have | D．has |
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| There __________ some children in the painting room. They are studying painting. |
—Where is Mr Green now ? I haven’t seen him for a few days .
—He _____ to Hong Kong .| A．goes | B．will go | C．is going | D．has gone |
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— Is your father in?
— No, he ______ for three hours.| A．was out | B．has been out | C．went out | D．has gone out |
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