题干
This is the book _____ the teacher spoke in class.
A：which
B：that
C：of which
D：of that
答案(点此获取答案解析）
C
A：which
B：that
C：of which
D：of that
Ti+2MgCl2 ，若要制得96 g 钛，计算至少需要镁的质量。