— You speak French so well. How long have you learned it? — ________ I was fifte
题型：不详难度：来源：
— You speak French so well. How long have you learned it?
— ________ I was fifteen.| A．Until | B．Since | C．When | D．Before |
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答案
| B |
解析
| since +一般过去时，相当于用延续性动词，how long应该与延续性动词连用，故选答案为B |
举一反三
Chinese is becoming more and more popular. It ________ in many schools in foreign countries.| A．teaches | B．is teaching | C．is taught | D．has taught |
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Not only Susan but also Sandy _________ abroad for traveling. They will return next Sunday.| A．has gone | B．have gone to | C．have been | D．has been to |
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When I dropped in, Dr Smith _____, so we only had time for a few words.| A．just left | B．was just leaving | | C．has just left | D．had just left |
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--- Would you please give him the paper the moment he _______?
--- No problem.| A．arrives | B．appeared | C．came | D．reaches |
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It _______ long ______ we know the result of the experiment.| A．will not be, before | B．is, after | C．will not be, until | D．is, before |
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