【单选题】【消耗次数：1】
Every means _______ been tried to solve the difficult problem.
①
has
②
have
③
is
④
are
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The teachers tried to __convince____ these students that they could solve the complicated problem, however, they just didn’t see the point.
①
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②
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The ____ problem of bring a spaceship back from the moon has been solved.
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③
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The _____problem of bringing a spaceship back from the moon has been solved.
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②
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【判断题】
判断线上的内容是否正确：The teachers tried to __convince____ these students that they could solve the complicated problem, however, they just didn’t see the point.
①
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③
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随机题目
【单选题】
若库存管理系统要取消月末结账，必须先取消（ ）月末结账，之后库存管理系统取消结账时，在月末结账窗口点击“取消结账”即可。
①
存货核算
②
应付款管理
③
库存管理
④
采购管理