【单选题】【消耗次数：1】
He _______ working before 6 o’clock.
①
usually has finished
②
has usually finished
③
usually finished
参考答案：
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相关题目
【单选题】
Because he hadnt finished his assignment, so he continued working in the classroom. Is this a complete sentence?
①
Yes
②
No
【单选题】
____ it was finished in time.?
①
As the work was difficult ?
②
Difficult as the work was?
③
Difficult as was the work ?
④
As was the work difficult?
【单选题】
It was quite a few years before Mark Twain finally finished his last novel.
①
A．在马克·吐温完成最后一部小说之前，已经是好几年了。
②
B．在马克·吐温完成最后一部小说之前，又是好几年了。
③
C．过了好几年，马克·吐温才终于完成最后一部小说。
④
D．马克·吐温完成了最后一部小说时，又过了好几年。
【单选题】
（ ） he finished writing the composition in such a short time surprised us all.
①
What
②
How
③
That
④
If
【单选题】
A: I thought you were working until 6:30. B: [填空], but we finished our meeting at 5:30 and were let go.
①
I tried to
②
I hoped so
③
Id love to
④
I was supposed to
【单选题】
11. Having finished the letter, he_________ it carefully and sealed the envelop with a kiss.
①
folded
②
bent
③
turned
④
curved
随机题目
【单选题】
在骨骼肌兴奋-收缩耦联过程中起关键作用的离子是（）
①
Na<sup>+</sup>；
②
K<sup>+</sup>；
③
Ca<sup>2+</sup>；
④
Cl<sup>-</sup>；
⑤
Mg<sup>2+</sup>
【单选题】
短时间的一连串最大刺激作用于肌肉，当相继两次刺激间的时距小于绝对不应期，后一刺激则出现（）
①
一连串单收缩
②
一次单收缩
③
无收缩反应
④
不完全强直收缩
⑤
完全强直收缩
【单选题】
关于骨骼肌收缩机制，下述错误的是（）
①
引起兴奋－收缩耦联的离子是Ca<sup>2+</sup>；
②
细肌丝向粗肌丝滑行；
③
Ca<sup>2+</sup> 与横桥结合；
④
横桥与肌纤蛋白结合；
⑤
肌节缩短
【单选题】
血浆pH值主要取决于（）
①
KHCO<sub>3</sub> /H<sub>2</sub> CO<sub>3</sub> 缓冲对
②
K<sub>2</sub> HPO<sub>3</sub> /KH<sub>2</sub> PO<sub>3</sub> 缓冲对
③
NaHCO<sub>3</sub> /H<sub>2</sub> CO<sub>3</sub> 缓冲对
④
血红蛋白钾/血红蛋白
⑤
蛋白质钠盐/蛋白质