单项选择题

The professor found himself constantly ______ the question: How could anyone do these things

A．presiding
B．poring
C．pondering
D．presuming
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单项选择题
This is not the right ______ to ask for my help; I am far too busy even to listen!
A．moment
B．situation
C．opportunity
D．circumstance
单项选择题
He raised his eyebrows and stuck his head forward and ______ it in a single nod, a gesture boy, used then for O. K. when they were pleased.
A．shrugged
B．tugged
C．jerked
D．twisted
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