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【单选题】
金黄色葡萄球菌感染后脓液的特征是A.
稀薄、量大，呈淡红色
B.
淡绿色，甜腥臭味
C.
稠厚、黄色，无臭味
D.
恶臭，有产气性
E.
稠厚，呈灰白色
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举一反三
【单选题】A new technique_________, the yields as a whole increased by 20 percent.
A.
working out
B.
having worked out
C.
having been worked out
D.
to have been worked out
【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】________ 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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