单项选择题

The (principal) mason for the great (number) of smoke is (that) there are (too many) factories in this are

A． principalB. numberC. thatD. too many
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单项选择题
A．madeB．doneC．finishedD．performed
A．made
B．done
C．finished
D．performed
单项选择题
A．excusesB．causesC．wordsD．cause
A．excuses
B．causes
C．words
D．cause
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