英语一道选择,I can't find my history book------------------i know it mu_英语解答

英语一道选择,
I can't find my history book------------------i know it must be somewhere in the living room
Abecause Bbut Csince Duntil
book后有逗号

人气：221 ℃　时间：2020-04-08 08:55:10

解答

转折关系,不能找到但知道在这里,选Bbut前面不是不加逗号的吗？可加可不加，however才是后面一定要加逗号