—What about the student in your class, Mr. Wang?—The doctor said that ________ sleep caused him poor memory and poor concentration.
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A
lacking of
B
lacked in
C
lacking
D
lack for
推荐题目
       herself with other girls,she feels she is quite lucky.    
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A
Comparing
B
Compared
C
To compare
D
Being compared
Look, what a dirty classroom we have got! It really wants ______.
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A
clean
B
cleaned
C
cleaning
D
to clean
While riding in the street, _____________.
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A
someone called me from behind
B
my bike broke down
C
I heard my name called
D
an old man knocked down