His uncle ________ for a week.
A．has arrived hereB．has been here
C．came hereD．will get here
B

試題分析：句意：他的叔叔已經(jīng)在這兒一周了。句中有for a week表示一段時(shí)間，用現(xiàn)在完成時(shí)，同時(shí)謂語動(dòng)詞要有延續(xù)性，故選B
點(diǎn)評(píng)：動(dòng)詞的時(shí)態(tài)是學(xué)習(xí)英語過程中非常重要的知識(shí)�，F(xiàn)在完成時(shí)表示動(dòng)詞在過去發(fā)生對(duì)現(xiàn)在造成的影響。現(xiàn)在完成時(shí)往往和already,yet,for+一段時(shí)間，since+點(diǎn)時(shí)間的時(shí)間狀語連用。一般過去時(shí)只表動(dòng)詞在過去發(fā)生，一般現(xiàn)在時(shí)表示習(xí)慣性的動(dòng)詞或是客觀真理、事實(shí)。
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