问题
单项选择题
Greater efforts to increase agricultural production must______if food shortage is to be avoided.
A.be made
B.make
C.have made
D.have been made
答案
参考答案:A
Greater efforts to increase agricultural production must______if food shortage is to be avoided.
A.be made
B.make
C.have made
D.have been made
参考答案:A