My brother has been teaching ________ he was 21 years old.A．whenB．ifC．forD．since
题型：不详难度：来源：
| My brother has been teaching ________ he was 21 years old. |
答案
| D |
解析
试题分析：主句用的是现在完成时态。since，自从……（到现在）现在完成时的标志词。句意：我的弟弟自从21岁就一直在教学。 |
举一反三
_____ it was very cold, _____ my friend still went swimming in Jialing River this morning. | A．Although;/ | B．Although; but | C．But; although | D．/;although |
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—Oh! I failed again.
—Don’t lose heart. One more effort (努力), _________ you will succeed.| A．so that | B．since | C．however | D．and |
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She won’t lose weight______ she keeps a diet and takes exercise every day.| A．unless | B．if | C．because | D．since |
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____ it’s raining , _______ they expect to go to the park. | A．Although ; but | B．Although ; / | C．/ ; / | D．But ; although |
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—Tom isn’t feeling very well.
—He seems to have a cold the weather changes suddenly.| A．before | B．so | C．because | D．if |
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