One or two man-made satellites （） in this country every year.
A.have been sent up
B.are sent up
C.will send up
D.is sent up
正确答案：are sent up
One or two man-made satellites （） in this country every year.
A.have been sent up
B.are sent up
C.will send up
D.is sent up
正确答案：are sent up