Class regulations state _____ is the last to leave the classroom _____ off all the lights.
#92533
A
no matter who; should turn
B
whoever; shall turn
C
whomever; turns
D
whoever; turn
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The Great Wall is __________ tourist attraction that millions of people pour in every year.
#92521
A
so a well-known
B
a so well-known
C
such well-known a
D
such a well-known
It was not until the teacher had explained it three times _______ how to work out the problem.
#92129
A
did he understand
B
had he understood
C
that he understood
D
that he didn’t understood