You can't go out and play ______ you've done your homework. [ ]A. when B. since C. while D

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• Little Kate went to school _______ it rained heavily yesterday.[ ]A. though B. if C. but D. since -九
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• I was just leaving the office ______ the telephone rang. [ ]A. when B. and C. while D. before -九年级英语
• —How are you feeling here?— It's quite hot. I don't know _____ to go or stay. [ ]A. how B.
• —Could we play football in your playground, Sir? —No, ________ you have the principal's note. [
• They will lose the game _______they try their best, [ ]A. unlessB. onceC. since D. after -九年级英语
• _____ you are in trouble, let me know. I'll give you a hand. [ ]A. Whenever B. Wherever C. Howe
• _____ the boy was walking down the street, the UFO landed. [ ]A. Why B. Where C. While D. Whenever -
• —It's 10 o'clock now. I must go. —It's raining heavily outside. Don't leave ____
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