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doing, yesterday, at this moment, you, what, were _____________?
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The students all stood up when the teacher _______ (进入)the classroom.
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已知a,b∈R且ab≠0,若(x﹣a)(x﹣b)(x﹣2a﹣b)≥0在x≥0上恒成立,则( ) A . a<0 B . a>0 C . b<0 D . b>0
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Last Friday a storm swept through two villages in the New Territories, destroying fourteen homes.
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