单项选择题

(Let's not) waste time on (matters of no important). We have other (vital) problems to (deal with)

A．Let's not
B．matters of no important
C．vital
D．deal with
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单项选择题
No matter (whatever happens), we're determined to (do our best) and (make) the experiment (a success)
A．whatever happens
B．do our best
C．make
D．a success
单项选择题
The seventeenth century was one (which) many significant (advances) (were made) (in both) science and philosophy.
A．which
B．advances
C．were made
D．in both
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