单项选择题

The scientists have absolute freedom as to what research they think it best to_______.

A．engage
B．devote
C．seek
D．pursue
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单项选择题
During the summer holiday season it is difficult to find a(n) _______room in the hotels here.
A．empty
B．vacant
C．free
D．deserted
单项选择题
He is quite worn out from years of hard work. He is not the man _______he was twenty years ago.
A．which
B．that
C．who
D．whom
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