We are now in the age of great changes. Everything sometimes ________ before it is felt.
A．changeB．had changedC．has changedD．changed
C

試題分析：整個句子用的都是現(xiàn)在時，所以排除BD選項。主語是“everything”故排除A選項。用現(xiàn)在完成時強調(diào)結(jié)果。句意：我們現(xiàn)在處在偉大的變革時代。常常是等到一切變化了我們才感覺到。
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