Schools across China are expected to hire 50,000 college graduates this year as short-term
teachers, almost three times the number hired last year, reduce unemployment pressures.
A. help
B. to have helped
C. to help
D. having helped
网友回答
A. help
B. to have helped
C. to help
(答案→)D. having helped
解析：可联系答.案.网客服索取。