He ________this new computer since last week. It is birthday present.
A．has boughtB．bought C．has hadD．will buy
C

試題分析：根據(jù)時(shí)間狀語自從上星期以來，可知本句描述的是現(xiàn)在已經(jīng)完成的動(dòng)作，buy是瞬間動(dòng)詞，不能和表示一段時(shí)間的時(shí)間狀語連用。故選C。
點(diǎn)評(píng)：英語完成時(shí)態(tài)中有瞬間動(dòng)詞與持續(xù)性動(dòng)詞之分，瞬間動(dòng)詞只表示瞬間動(dòng)作，不能和表示一段時(shí)間的時(shí)間狀語連用，反之持續(xù)性動(dòng)詞也是一樣。再?zèng)]有時(shí)間狀語的情況下，就要結(jié)合語境具體分析。
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