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
（） other courses, he devotes all his time to studying English.

A．No liking
B．Liking not
C．Having not liked
D．Not having liked
单项选择题
(The Chinese) were the first and (large) ethnic(种族) group (to work) on the construction (of) the transcontinental railroad system.（）

A. The Chinese
B. large
C. to work
D. of
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