关于many of whichThere used to be a lot of coal mines,many of ---- have been closedA.which B.them 请问为何答案为A?请解释,谢谢many of which是何意？为什么用Which?请详解

关于many of whichThere used to be a lot of coal mines,many of ---- have been closedA.which B.them 请问为何答案为A?请解释,谢谢many of which是何意？为什么用Which?请详解 many .many of用法 many of many of 关于a lot of,many much little few 的题 选哪个,请给出原因.A.involving,that B.involved,that C.invovled,where D.involving,whichThere is a new problem_______in the popularity of private cars ______road conditions need to be improved. 如何理解这句话里whichthere are some countries such as Denmark,Finland,Italy,Turkey,Australia,and Belgium which also celebrate Mother's Day on the second Sunday of May. 关于几个英语词组的辨析the large number of; a large Sum of; a great many;a lots of many kinds of “visit many places of “many kinds of clouds”, many kinds of 造句! many kinds of翻译 Think of the many many of people对不对 many return of the a man of many 用many of造句