英语简单选择求详解As is recorded in history,silkworms were first raised in(what) is today Hebei Province.请问为什么括号里的不能选which呢?

英语简单选择求详解As is recorded in history,silkworms were first raised in(what) is today Hebei Province.请问为什么括号里的不能选which呢? 求大神详解英语选择 一到简单英语选择 （求详解）Today is April 6th,so yesterday__April 4thA isn't B was Cwasn't 英语单项选择如图.求详解. 英语选择此题有疑,求详解谢 英语选择,麻烦详解 初中英语选择 求详解 英语语法选择,求详解 英语选择 求详解 【第二题】答案是B 一到简单英语选择 谢谢 （求详解）I'm busy from Monday to Friday .So I watch TV every dayA can B CAN'T Ccouldn't 英语used to do this material __houseA is used to makeB is used to makingC used to makeD used to making应该选择哪一个求详解, 简单的单项选择Wang Lei is young ,but she plays basketball _____ her father.A.as good asB.as well asC.as better asD.as best as ------,dolphins have no sense of smell.a,as known as far b,it is known as far c,as far as is known求详解 简单英语选择..帮个忙呗.. 简单英语选择 英语简单选择填空 求详解为什么选择B 英语选择 It is ( ) of students to stay up reading till night before the final exam.A.common B.typical C.normal D.regular求详解,