单项选择题

Where to find the teacher and where to do the experiment ______.

A. are not known
B. is not known
C. has not known
D. have not known
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It is widely believed that the pull of gravity on a falling raindrop changes ______ round shape into a teardrop shape．
A．of the drop
B．the drop's
C．drop of
D．drops the
单项选择题
It seems to me that what Lucy saw and heard ______ very interesting.
A. was
B. were
C. is
D. are
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