单项选择题

It is not easy to learn English well but if you ______, you will succeed in the end.

A．hang up
B．hang about
C．hang on
D．hang onto
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单项选择题
______ from the space, the earth looks like a blue ball as it is mostly covered by water.
A．Having been seen
B．Being seen
C．Seen
D．Seeing
单项选择题
He didn t come to the party last night. He ______ to see us.
A．might not have wanted
B．could not have wanted
C．should not have wanted
D．ought not to have wanted
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