单项选择题

(Since the beginning) of this century, more and more scientists (have become) inter-ested (in) (the way how) the human brain works.

A. Since the beginning
B. have become
C. in
D. the way how
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单项选择题
We (wish) that you (didn't have) such a lot of (work), otherwise you (would have enjoyed) the party.
A. wish
B. didn't have
C. work
D. would have enjoyed
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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