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【判断题】
电弧炉炼钢的特点之一是可以制造氧化性气氛,有利于去硫和脱氧。A.
正确
B.
错误
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【单选题】When I entered the classroom, I saw Mary ______ at the desk and ______ a letter.
A.
seating; writing
B.
seated; wrote
C.
sitting; wrote
D.
seated; writing
【单选题】Each of the following sentences contains ONE mistake. Find it out and correct it. Jack was washing dishes then Mary knocked at the door and entered.
A.
Jack was washing dishes as Mary knocked at the door and entered.
B.
Jack was washing dishes while Mary knocked at the door and entered.
C.
Jack was washing dishes when Mary knocked at the door and entered.
D.
Jack was washing dishes as soon as Mary knocked at the door and entered.
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