单项选择题

A．source
B．beginning
C．start
D．origin
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单项选择题
A．could drawB．should drawC．was able drawD．was drawing
A．could draw
B．should draw
C．was able draw
D．was drawing
单项选择题
A．sinceB．forC．becauseD．because of
A．since
B．for
C．because
D．because of
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