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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单项选择题
I left for the office earlier than usual this morning ______ traffic jam.
A．in case of
B．for the sake of
C．in line with
D．at the risk of
单项选择题
The early pioneers had to ______ many hardships to settle on the new land.
A．go along with
B．go back on
C．go through
D．go into
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