单项选择题

Hi, Bob! I can't find my history book. ______ you ______ it anywhere

A．Did; see


B．Do; see
C．Have; saw


D．Have; seen
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单项选择题
It is essential that these application forms back as early as possible.
A．must be sent


B．will be sent
C．are sent



D．be sent
单项选择题
Duty is an act or a course of action that people （） you to take by social customs, law or religion.

A. persuade
B. request
C. instruct
D. expect
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