Never before ________ buying a computer, but now it seems a necessity in my everyday life.
A．did I think ofB．have I thought ofC．I thought ofD．I have thought of
B
考查部分倒裝。Never是表否定意義的詞，放在句首時(shí)，句子謂語要部分倒裝，排除C,D；根據(jù)never和before,可知句子應(yīng)該用現(xiàn)在完成時(shí)態(tài)，所以選B。
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