【外加同位语从句TheNationalEducationDepartmentsaysthatschoolsaftyhassetoffalarmbellswithfrequentreportsofseriousaccident_________studentsgotinjuredorkilled.A.thatB.inwhichC.byehichD.forwhen我像问一下,为什么不】

　　外加同位语从句

　　TheNationalEducationDepartmentsaysthatschoolsaftyhassetoffalarmbellswithfrequentreportsofseriousaccident_________studentsgotinjuredorkilled.

　　A.that

　　B.inwhich

　　C.byehich

　　D.forwhen

　　我像问一下,为什么不能选择A呢?

　　哪些词语不可以使用同谓语从句啊?

　　使用同谓语从句需要注意哪些呢?