About ________ of the workers in the factory were born in the ___________.
| A．two-thirds;1970 | B．two-thirds;1970s |
| C．two-third; 1970 | D．two-third;1970s |
About ________ of the workers in the factory were born in the ___________.
| A．two-thirds;1970 | B．two-thirds;1970s |
| C．two-third; 1970 | D．two-third;1970s |
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