The large grassland, reaching out far away, looks extremely beautiful the blue and clean sky．
A. with
B. against
C. through
D. Beyond
网友回答
A. with
(答案→)B. against
C. through
D. Beyond
解析：考查介词用法。against prep．以……为背景，衬托着。句意为：大片的草地，延伸到远方，以蓝天白云为背景，看起来极为美丽。