I am so tired，for I ________ English for 2 hours.
A．is studying　B．have been studying
C．was studying　D．had been studying
B
句意：我好累，因?yàn)槲乙呀?jīng)學(xué)習(xí)英語(yǔ)兩個(gè)小時(shí)了。根據(jù)“for 2 hours”可知，此處表示動(dòng)作從過(guò)去某一時(shí)間開(kāi)始，一直延續(xù)到現(xiàn)在，可能還要繼續(xù)下去，故應(yīng)用現(xiàn)在完成進(jìn)行時(shí)。
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