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1. The mother said she would __ her son washing the dishes if he could finish his assignment before supper. A let down B let alone C let off D let out 2. This kind of material can __ heat and moisture. A delete B compel C constrain D repel 3. Understanding the cultural habits of another nation, especially __ containing as many different subcultures as the United States, is a complex task. A one B the one C that D such 4. In order to raise money, Aunt Nicola had to __ with some of her most treasured possessions. A divide B separate C part D abandon 5. The new appointment of our president __ from the very beginning of next semester. A takes effect B takes part C takes place D takes turns 答案： 1-5 CDACA 1. 选C ①let off原谅，不处罚，放过With your record, you can hardly expect to let off lightly. ②let down使失望，食言③let alone别管，别烦Let her alone! She didnt pick a quarrel with you.④let out让离开Open the door and let the cat out. | 
