单项选择题

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

A．A
B．B
C．C
D．D
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单项选择题
I (am looking) forward (to) (receive) your letter! she said (happily).
A．A
B．B
C．C
D．D
单项选择题
The seventeenth century was one (which) many significant (advances) (were made) (in both) science and philosophy.
A．A
B．B
C．C
D．D
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