单项选择题

______ we have all the materials ready, we should begin the new task at once.

A．Since that
B．Since now
C．By now
D．Now that
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单项选择题
______ is known to the world, Beethoven is a great musician.
A．That
B．Which
C．As
D．It
单项选择题
By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.
A．are living
B．will be riving
C．have lived
D．will have lived
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