单项选择题
The tree fell down ______ she had time to run away.
A．as
B．after
C．before
D．until
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单项选择题
With summer coming on, the weather gets hot ______.
A．day and day
B．day and night
C．day by day
D．day in and day out
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单项选择题
--I find ______ French grammar very difficult.-- I agree. Though ______ grammar is poor, you can pronounce well.
A．the; your
B．the; the
C．/;your
D．/;/
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