单项选择题

He reached the top of the hill and stopped ______ on a big rock by the side of the path.

A．resting
B．rest
C．to rest
D．to have rested
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I will be late ______ I leave immediately.
A．unless
B．until
C．if
D．or
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By the end of this July, ______ English for six year.
A．is studying
B．have studied
C．has studied
D．shall have studied
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