单项选择题

______ that this region was so rich in natural resources.

A．Little he knew
B．Little did he know
C．Little he did know
D．Little he had know
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单项选择题
The actors have to ______ before they appear in front of the strong lights on television.
A．make up
B．paint up
C．cover up
D．do up
单项选择题
I was ______ work last week, but I change mind.
A．to have started
B．to start
C．to be starting
D．to have been starting
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