单项选择题

The teacher spoke so fast that it was hard for the students to ______what he was saying.

A．take in
B．take out
C．take up
D．take over
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单项选择题
With the flowers______ everywhere, the park looks beautiful.
A．to bloom
B．blooming
C．be blooming
D．to be blooming
单项选择题
______is known to us all, the earth moves around the sun.
A．Because
B．For
C．So
D．As
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