单项选择题

______ the problems are numerous, we must still try to solve them.

A．In spite of
B．Although
C．In order that
D．Since
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单项选择题
A new technique ______, the yields as a whole increased by 20 percent.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
单项选择题
These shoes are too big. Ask the clerk to bring you a smaller ______.
A．suit
B．set
C．one
D．pair
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