Toni Morrison, Nobel Prize-winning American writer, says if there’s a book you really want to read, but it ______ yet, then you must write it.

A．hasn’t been written

B．hasn’t written

C．doesn’t write

D．isn’t written

马斯洛的需求层次理论和赫兹伯格的双因素理论属于（）激励理论。

A.内容型

B.过程型

C.调整型

D.目的型