单项选择题

Either the brother or the sister will tell their father about what has happened.

A．Either
B．or
C．their
D．happened
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What he does, he always does it well, though he has some difficulties.
A．What
B．it
C．though
D．some
单项选择题
Hard as he worked, but Mr. Brown couldn't keep the shop properly.
A．Hard
B．as
C．but
D．keep
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