选择题:My wallet is nowhere to be found. I _____ in the s

题目内容:

My wallet is nowhere to be found. I _____ in the store this afternoon.
(A) must drop it
(B) must have dropped it
(C) should have dropped it
(D) ought to have dropped it
参考答案:

著名诗句“冬天已经来了,春天还会远吗?”出自( )(A)《假如生活欺骗了你》(B)《致大海》(C)《

著名诗句“冬天已经来了,春天还会远吗?”出自( )(A)《假如生活欺骗了你》(B)《致大海》(C)《西风颂》(D)《我曾经爱过你》

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已知平面a截一球面得圆M,过圆心M且与a成60°,二面角的平面β截该球面得圆N,若该球的半径4,圆M

已知平面a截一球面得圆M,过圆心M且与a成60°,二面角的平面β截该球面得圆N,若该球的半径4,圆M的面积为4π,则圆N的面积为 A.7π B.9π C.11π

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