题目

某有机物样品4.6g完全燃烧，将燃烧后的产物通入足量石灰水中完全吸收，经过滤得到沉淀20克，滤液质量比原石灰水减少5.8克，该有机样品可能是A. C2H6O2                                                 B. CH4和C2H6的混合物 C. CH4O和C3H8O的混合物                     D.C2H6O和C3H8O3的混合物 Nobody knows ________ to visit our school ．A.when will he comeB.when does he comeC.when he will comeD.when he does come