His arms were sunburnt because he         in the sun all day.
A．had satB．satC．is sittingD．had been sitting
D

試題分析：考查時(shí)態(tài)。本句中的all day一整天，該短語(yǔ)與完成進(jìn)行時(shí)連用，根據(jù)前半句的were說明只有過去完成進(jìn)行時(shí)的形式，句意：他的胳膊賽壞了，因?yàn)橐徽焖甲陉?yáng)光下。故D正確。
點(diǎn)評(píng)：時(shí)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(shí)間狀語(yǔ)。要根據(jù)時(shí)間狀語(yǔ)來選擇合適的時(shí)態(tài)，在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處。
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