He met many problems ______ he was going over his lessons.[ ]A. before B. as soon as C. since D. whi

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• 选择填空。You must study English well ______ it is very useful. [ ]A．but B．because C．so -七年级英语
• ____ I have a lot of homework to do every night. I still spend half an hour watching TV. [ ]A. If B.
• — How long has the nationwide ban (禁止) on plastic bags been put into practice?— the beginning of Jun
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