A good, college history textbook includes ______about history.

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问题 A good, college history textbook includes ______about history.

选项 A、every student to know
B、should every student know
C、in which every student knows
D、what every student should know

答案D

解析 The verb includes needs a noun structure as its direct object. What every student should know is the beginning of a noun clause.

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