单项选择题

All students in the class ______ a loud laugh when the professor told them a joke.

A．let up
B．let down
C．let off
D．let out
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单项选择题
It can be safely ______ that there is no living beings on that planet.
A．resumed
B．assessed
C．assumed
D．assured
单项选择题
You said the post office is on this block, can you be a bit more ______
A．particular
B．specific
C．abstract
D．especial
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