已知集合A={1,m},B={2,3},A ∩B={2},则A∪B=_____。
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秋冬之际,由于天气逐渐变冷,牧场上的草以固定的速度在减少。已知一个牧场上的草可供45头牛吃4天或可供25头牛吃6天。照此计算,这个牧场可供几头牛吃10天?
I’ve already told you that I′ m going to buy it, ____________
A. however much it costs
B. how much does it cost
C. however does it cost much
D. no matter how it costs
'May I speak to your manager Mr. Williams at five o′clock tonight?' 'I′m sorry. Mr. Williams ___________ to a conference long before then.'
A. have gone
B. would have gone
C. had gone
D. will have gone
The project, ___________ by the end of 2020, will expand the city′ s telephone network to cover 1,000,000 users.
A. accomplished
B. being accomplished
C. to be accomplished
D. having been accomplished