By improving reading skills you can read faster and understand more of you readA. that

问题补充：

By improving reading skills, you can read faster and understand more of you read．

A. that

B. what

C. which

D. whether

答案：

A. that

(答案→)B. what

C. which

D. whether

解析：考察从句连词的选择。根据句子结构可知，该句是of后面的宾语从句，从句中缺少read的宾语，因此选择what，that在从句中不作成分，which用于有范围的选择 D意为是否，在从句中不作成分。