分析这3道我错的，详细如图

42.He often think of __C__he can do more for the four modernizations.
A.what B.how C.that D.which
从句中有宾语more，即从句是一完整句子，所以需要一个引导词作该完整从句的同位语
若从句中无宾语more，选择A

46.He is very brave.I wish I ___A____his courage.
A.had B.have C.had had D.would had
虚拟语气

48.Tom killed the cat.I'll ask him why ___A______.
A.he did that B.did he do that C.he did D.he has done so
why引导的从句作“宾语补语”，why后的从句的部分需是一有实际意义的整句
本来D也是一完整句，但它的时态与前面不一致.如果D是：he had done so.也可用它.



供你参考，丫头!