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4.认真制定这项计划是有必要的。（necessary+ 从句） 5.The candidates’ experiences and qualifications will be taken into consideration when the decision is made. It is necessary that the plan (should) be worked out carefully. 作决定时要考虑候选人的经历和资格。 Ⅳ.单项填空 1.—What do you know about Darwin after he returned from the trip by sea? —Well,he got married and down to live in Kent. A.got B.worked C.took D.settled 解析 settle down定居。此处表示“他结婚了 并定居在Kent”。 D 2.—I am going to join them in the game. — . A.Have fun B.That’s very nice of you C.Have a pleasure D.Maybe you like it 解析 have fun=have a good time玩得高兴， 符合语境。 A 3.To be to the House,a person must be at least twenty-five years old and must have been a United States citizen for seven years. A.elected B.selected | 
