单项选择题

______his lecture is short，it gives us a clear picture of the new program．

A．if
B．Because
C．Although
D．When
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单项选择题
Don't______me to help you if you are not work ing hard．
A．guess
B．speak
C．plan
D．expect
单项选择题
There is no doubt______he is a aood employee．
A．as
B．who
C．that
D．what
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