The computer was invented in the 1940’s and ______ quite a lot ever since.
A．was changedB．had changed
C．has been changedD．will change
C

試題分析：考察時態(tài)。本題的關(guān)鍵在于后面的時間狀語ever since自從，該短語要和現(xiàn)在完成時連用。句意：電腦是20世紀(jì)40年代發(fā)明的，從那以后一句發(fā)生了很大的改變。故C正確。
點評：時態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時間狀語。要根據(jù)時間狀語來選擇合適的時態(tài)，在平時的學(xué)習(xí)中要注意積累有關(guān)時態(tài)的用法和各種時態(tài)的特殊之處。如since， so far等經(jīng)常與現(xiàn)在完成時連用。在條件狀語從句中用一般現(xiàn)在時代替將來時等等。
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