【单选题】【消耗次数：1】
The engineers in this lab spent several weeks _______ their plans for the new bicycle.
①
counting
②
stripping
③
elaborating
④
casting
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相关题目
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My teacher had been with me several weeks before I understood that everything has a name.
①
A．在我知道每样东西都有一个名字以前，老师已经教我好几个星期了。
②
B．老师和我相处了好几个星期，我都不知道每样东西还有一个名字。
③
C．在我知道每样东西都有一个名字以前，老师和我已经相处好几个星期了。
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D．老师教了我好几个星期，我才知道每样东西都有一个名字。
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随机题目
【单选题】
下列有关心动周期的错误叙述是
①
心动周期是指心脏机械活动的周期
②
心动周期是指心肌电活动周期
③
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④
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