单项选择题

(What) he does, he always does (it) well, (though) he has (some) difficulties.

A. What
B. it
C. though
D. some
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(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
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
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