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
(Not until) my mother told me (the sad news) last night (did I knew) that our neighbor Dr. Li (was killed) in a car accident the week before.
A．Not until
B．the sad news
C．did I knew
D．was killed
单项选择题
(That) troubles me is (that) I can't learn (all these) English idioms (by heart).
A．That
B．that
C．all these
D．by heart
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