______ he can hardly read is ____________ he is slow in mind.
A．what; thatB．That; whatC．What; becauseD．That; because
D

試題分析：考查名詞性從句。句中that引導(dǎo)主語從句，從句中不缺少任何成分；because引導(dǎo)表語從句，在從句中作原因狀語。句意：他不能閱讀是因?yàn)樗季S慢。故D正確。
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