单项选择题

The registrar(管注册的人) has requested that each student and teacher (sign) (their name) on the grade sheet before (submitting) (it).

A. sign
B. their name
C. submitting
D. it
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单项选择题
She ______ be in the classroom. I saw her going to the cinema just two minutes ago.
A．mustn't
B．shouldn't
C．can't
D．needn't
单项选择题
______ other courses, he devotes all his time to studying English.
A．No liking
B．Liking not
C．Having not liked
D．Not having liked
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