单项选择题

I purposely ______ from extending these observations to any length.

A．abstain
B．sustain
C．retain
D．detain
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单项选择题
By turns I ______ and flush with heat, and Theodora is greatly disturbed about me.
A．shiver
B．quaver
C．tremble
D．quiver
单项选择题
Then it was Jerry's duty lo cautiously ______ the arrow had it missed the mark.
A．recover
B．regain
C．refund
D．retrieve
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