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【判断题】
当电力系统电压普遍偏低时，可以采用下调变压器分接头提高低压侧电压。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】________hard before, Tom is afraid of failing in the exam.
A.
Having been worked
B.
Not to have worked
C.
Having never worked
D.
Never have worked
【单选题】_______ , the girl worked in a hurry.
A.
Having swept the room
B.
Another room swept
C.
Having another room to sweep
D.
Having another room to be swept
【单选题】Having worked for three hours or so they stopped _____ a rest.
A.
taking
B.
to take
C.
having
D.
having taken
【单选题】________ in the company for three years, Mark has become experienced in business negotiations. A) Having worked B) Have been working C) Have worked D) Worked
A.
Having worked
B.
Have been working
C.
Have worked
D.
Worked
【单选题】all day, I went to bed early.
A.
Working hard
B.
Worked hard
C.
Having worked hard
D.
To work hard
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