单项选择题

Mary was not in her bedroom yesterday afternoon、 She( )in her classroom.
should have been
B、 must have been
C、 must be
D、 should be

A、

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单项选择题

I _____ two hours to go over the lessons.

A、took
B、charged
C、spent
D、cost

多项选择题

马克思把人的需要分为三种层次，包括（）。

A.文化需要
B.自然需要
C.精神需要
D.社会需要