15．---Where are your parents？
---They are in the kitchen，they ______the dinner for the party the whole day．（　�。�
A．are preparingB．have been prepared
C．have been preparingD．were preparing

分析 --你的父母在哪里？
--他們在廚房里，他們整天在為聚會的晚宴作準備．

解答 答案：C 考查時態(tài)辨析．根據(jù)上下文及"the whole day"可知，表示在問話之前到現(xiàn)在"一直在準備"，要用現(xiàn)在完成進行時態(tài)．A項是現(xiàn)在進行時態(tài)，強調(diào)現(xiàn)在正在做，不強調(diào)連續(xù)性；B項是現(xiàn)在完成時態(tài)，表示已經(jīng)準備好了；D項是過去進行時態(tài)，但句中并沒有表示過去的時間狀語．

點評 解答此類問題要了解各種時態(tài)的用法，然后根據(jù)上下文及結(jié)合語境來選擇正確答案．

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