填空题


【参考答案】

cookers→cooks
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when→while
单项选择题
A．The fuel is cheap.B．They can be stopped and reignite.C．They are cheap to build.D．They must be used soon after fuelin
A．The fuel is cheap.
B．They can be stopped and reignite.
C．They are cheap to build.
D．They must be used soon after fuelin
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