How long __ you __(从事)the project?为什么答案是have,been working on

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• How long __ you __(从事)the project?为什么答案是have,been working on
• 1.---______ have you lived in Beijing?---Since 2000.A.When B.Why C.How long 可是我想知道A怎么不可以?我一直弄不懂when和since他们的区别啊!老弄混 希望帮我解释下!3.The heavy rain ______ me _______ the Great Wall last Friday.A.prevented; visiting B.stopped; to visit C.keep; from visiting 答案选的是A 我知道是选这个,但是c为什么不可以,他的句型也是对的,也有阻止某人做某事的意思哦
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