问题
选择题
______ he can hardly read is ____________ he is slow in mind.
A．what; that
B．That; what
C．What; because
D．That; because
答案
答案：D
题目分析：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。