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    【題目】In schools, students________ to sweep the floor after school.

    A.askB.are askedC.were askedD.will ask

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    A.servesB.servedC.is servedD.will be served

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    【題目】In many schools, all the students ________ to show their student cards when they enter the library.

    A.requiredB.were requiredC.requireD.are required

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    【題目】Many traffic accidents ________ because drivers use their smart phones while driving.

    A.causeB.have causedC.are causedD.were caused

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    【題目】To make your DIY work perfect, you'd better not start ________ you get all the tools ready.

    A.whenB.sinceC.beforeD.after

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    【題目】A true friend can see the pain in your eyes ________ everyone else believes the smile on your face.

    A.whileB.untilC.beforeD.because

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    【題目】I was giving a phone call to my mum________ Jim asked me for help.

    A.whileB.beforeC.afterD.when

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    【題目】She is listening to music ________ Peter is doing his homework.

    A.afterB.beforeC.whileD.unless

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    【題目】Chen Wei isn't at school today________ he is taking part in a robot competition in Shanghai.

    A.afterB.becauseC.beforeD.if

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