4、这就是一个人长胖的原因。 A.enoughexercises B.exercisesenough C.enoughexercise D.exerciseenough 10.Thenewmachine,if_________properly,willworkatleasttenyears. 【译文】如果是用得当,这台新机器会使用10年的。 A.use B.using C.beingused D.used【答案及简析】D。本题考查分词与主语之间的关系。"ifthenewmachineisusedproperly…"强化练习1. All of the flowers now r
5、aised here have developed from those _______ in the forest. A.once they grew B. they grew once C. they once grew D. once grew2. In the office I never seem to have time until after 5:30 pm, _____ many people have gone home.A. that
6、 B. whichC. whose time D. by which time9用心爱心专心3. Is this the reason _______ at the meeting for his carelessness in his work? A. he explained B. what he explained C. how he explained D. why he expl
7、ained4. Luckily, we’d brought a road map without ______ we would have lost our way. A. it B. thatC. this D. which5. When he was working there he ca