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?cè)趶N房里，他們整天在為聚會(huì)的晚宴作準(zhǔn)備．

解答 答案：C 考查時(shí)態(tài)辨析．根據(jù)上下文及"the whole day"可知，表示在問(wèn)話之前到現(xiàn)在"一直在準(zhǔn)備"，要用現(xiàn)在完成進(jìn)行時(shí)態(tài)．A項(xiàng)是現(xiàn)在進(jìn)行時(shí)態(tài)，強(qiáng)調(diào)現(xiàn)在正在做，不強(qiáng)調(diào)連續(xù)性；B項(xiàng)是現(xiàn)在完成時(shí)態(tài)，表示已經(jīng)準(zhǔn)備好了；D項(xiàng)是過(guò)去進(jìn)行時(shí)態(tài)，但句中并沒(méi)有表示過(guò)去的時(shí)間狀語(yǔ)．

點(diǎn)評(píng) 解答此類問(wèn)題要了解各種時(shí)態(tài)的用法，然后根據(jù)上下文及結(jié)合語(yǔ)境來(lái)選擇正確答案．

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