单项选择题
They always give the vacant seats to ______ comes first.
A．whoever
B．whomever
C．who
D．whom
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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
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