单项选择题

Ever since Picasso's paintings were on exhibition, there ______ large crowds at the museum very day.

A. is
B. have been
C. has been
D. are being
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One or two friends ______ coming over for supper soon.
A. is
B. are

C. has been
D. who are
单项选择题
______ you go on the earth, there is always gravity to keep your room from falling off.
A. When
B. Whenever
C. Since

D. Because
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