have been on加什么

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• I known you would want to known that这里为什么 要加would
• would you like some pears?--No,thanks.I think there ___ enough for usA.is B.are C,has been D.had beenc是不是应该改为have been因为pears 是复数,B也错了,因为要用完成时态请问,你觉得呢?
• 用如图所示的方法可以测出一个人的反应时间.甲同学用手握住直尺顶端刻度为零的地方,一同学在直尺下端刻度为a的地方做捏住尺子的准备,但手没有碰到尺子.当乙同学看到甲同学放开尺子时,立即捏住尺子,乙同学发现捏住尺子的b.已知重力加速度为g,a、b的单位为国际制主单位,则乙同学的反应时间t约等于_______图就是两个同学,甲同学在上,捏住尺子上端（即零刻度处）,乙同学（受测者）在下,准备捏住尺子半小时之内回答加50分!说到做到!但为什么尺子下落距离是a-b?我就是这一点不理解.
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• 亲们快来~几道时态填空题/这一课的题目是现在完成时.1时态填空：1）There____________(be)great changes in Shanghai during the past decade.Shanghai _________________(become)more and more beartiful .2)The German engineer ___________________(collect)a lot of Chinese stamps since he came to China,for he _________________(appreciate)Chinese history and culture2用have/has been (to) ,have/has been in ,have/has gone to 填空Where is Sara?She_____1_____Australia.Sounds great.___2_she ________2____
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• And I want a large box of chalk,too. 有and为什么还要加too
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