单项选择题

It' s already 5 o' clock now. Don' t you think it' s about time ______

A．we are going home
B．we go home
C．we went home
D．we can go home
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单项选择题
Writing is a slow process, requiting ______ thought, time, and effort.
A．significant
B．considerable
C．enormous
D．numerous
单项选择题
The ancient Egyptians are supposed ______ rockets to the moon.
A．to send
B．to be sending
C．to have sent
D．to have been sending
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