问题
选择题
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
答案
答案：B
表示几分之几，应该是基数词—+序数词的复数（单复数形式要根据基数词来决定），而in the +年后接s，故选答案B