单项选择题

(Since the beginning) of this century, more and more scientists (have become) interested (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

Paula (doesn' t want) to (attend) the meeting (and) Sheila doesn't (too).

A. doesn't
B. attend
C. and
D. too

单项选择题

I (remember) clearly (to return) the book to him last Wednesday, but now he (says) that (I didn' t).

A. remember
B. return
C. says
D. I didn't

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