--- How long has your mother ______ Beijing?
--- About two weeks. But she will come back tomorrow.

A．been toB．been inC．gone inD．gone in

B

解析試題分析：句意：你的母親在北京多久了？——大約兩個(gè)星期。但是她明天就要回來。在完成時(shí)態(tài)中has been to 是已經(jīng)去過某處，并且已經(jīng)回來了。has gone to 是已經(jīng)去了某處，但是到目前為止還沒有回來。 has been in 是已經(jīng)在某處，并且現(xiàn)在還在那里，而且有可能要延續(xù)下去。 結(jié)合語境可知選B。
考點(diǎn)：完成時(shí)態(tài)及動(dòng)詞用法
點(diǎn)評(píng)：英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時(shí)態(tài)。完成時(shí)態(tài)中的動(dòng)詞有瞬間動(dòng)詞和持續(xù)性動(dòng)詞之分，瞬間動(dòng)詞的過去分詞強(qiáng)調(diào)的是動(dòng)作的完成，持續(xù)性動(dòng)詞強(qiáng)調(diào)的是動(dòng)作的持續(xù)性�，F(xiàn)在完成時(shí)態(tài)中表示一段時(shí)間的時(shí)間狀語不能和瞬間動(dòng)詞連用，持續(xù)性動(dòng)詞不能和表示瞬間時(shí)間的時(shí)間狀語連用，需注意區(qū)分。

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