单项选择题

The situation today is obviously different from ______ it was about 30 years ago.

A．what
B．when
C．which
D．such
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单项选择题
Li Ming knows a lot about Canada. He must ______ a lot of books about that country.
A．had read
B．have read
C．read
D．have readed
单项选择题
The last man ______ the sinking ship was the captain.
A．left
B．to leave
C．having left
D．being left
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