Question

18．-What were they doing when the UFO arrived？
-_______________．（　　）

• A． Certainly．They are cleaning their classroom
• B． They was studying in the library
• C． They were eating lunch in the restaurant
• D． They were talked on the phone

Answer 1

分析 ---當(dāng)UFO到達(dá)時(shí)他們?cè)诟墒裁矗?br />---他們正在餐館里吃午飯．

解答 答案：C．根據(jù)問(wèn)句"What were they doing when the UFO arrived？"可知答語(yǔ)也要用過(guò)去進(jìn)行時(shí)．過(guò)去進(jìn)行時(shí)的構(gòu)成"主語(yǔ)+were/was+doing"．故選C．B也是過(guò)去進(jìn)行時(shí)，但主語(yǔ)是they，be動(dòng)詞要用were而不是was．故選C．

點(diǎn)評(píng) 本題要求掌握過(guò)去進(jìn)行時(shí)的構(gòu)成．根據(jù)問(wèn)話知道所用的時(shí)態(tài)是過(guò)去進(jìn)行時(shí)，故答語(yǔ)也要用過(guò)去進(jìn)行時(shí)．