单项选择题

______ is known to the world, Beethoven is a great German musician.

A．As
B．Which
C．That
D．Who
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单项选择题
By eleven o'clock the day before yesterday, we ______ at the station.
A．had arrived
B．have arrived
C．shall arrive
D．arrive
单项选择题
If she had studied harder, she ______.
A．wouldn't have failed
B．hadn't failed
C．should fail
D．wouldn't fail
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