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Turn on the television or open a magazine and you _____ adve

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Turn on the television or open a magazine and you _____ advertisements.
A.are often seeing B.will often see
C.often sees D.have often seen
应该选B吧 为啥那?为什么A 不对?
当我们说某件事(通常带有否定意思)取决于另外一件事时(也就是说另外一件事发生,这件事才会发生)在IF-句子的主句中用WILL 或者 going to 都可以,IF WE GO LIKE THIS ,WE WILL/WE ARE GOING TO LOSE ALL OUR MONEY.
但是当描述未来某件事发生在另外一件事之后时 ,必须用will或其他助词,if you turn on the TV or open a magazine you wll often see ADs.
此题隐藏了IF,只有B 说的过去,A 答案用进行时表将来,只是场合不对,you often see ad,不是取决于you turn on TV or open nagazine.