题干
.
_____ price decline ______ farmers' income, the central government has decided to buy more crops to protect farmers.
_____ price decline ______ farmers' income, the central government has decided to buy more crops to protect farmers.
A：Preventing; to affect
B：To prevent; affecting
C：Having prevented; affecting
D：To prevent; being affected
答案(点此获取答案解析）
B
