单项选择题

() from the apple tree.

A．It down fell
B．It fell down
C．Down fell it
D．Fell it down

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单项选择题
We arrived at the station () late, or we()the bus.

A．too much; would catch
B．a little too; had caught
C．much too; would have caught
D．too much; would have caught
单项选择题
We will not attack () we are attacked; if attacked, we will certainly counter-attack.

A．if
B．when
C．unless
D．even if
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