he can hardly read is he is slow in mind.A. what; thatB. That; whatC. What; becauseD. T

问题补充：

he can hardly read is he is slow in mind.

A. what; that

B. That; what

C. What; because

D. That; because

答案：

A. what; that

B. That; what

C. What; because

(答案→)D. That; because

解析：考查名词性从句。句中that引导主语从句，从句中不缺少任何成分；because引导表语从句，在从句中作原因状语。句意：他不能阅读是因为他思维慢。故D正确。