单项选择题

Their hesitation means ______ the experiment.

A. to give up doing

B. to give up to do
C. to be given up to do

D. giving up doing
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He ______ reading silently at first.
A. used not to

B. didn’t use to
C. was not used to

D. is not used
单项选择题
(There) are (thousand) of (different) types (of) roses.
A．there
B．thousand
C．different
D．of
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