题型来源于 2018年无锡中考题：
Let’s put the piano over there __________ the wall.
A. above B. against C. across D. around
句意：让我们把钢琴放在那边，靠着墙摆放。A.above在……正上方；B. against反对，紧靠；C.across穿过，横穿；D. around围绕，在附近。结合句意可知，钢琴只能靠着墙摆放，答案B。
单词解析
against
介词：反对；逆；违背；倚靠；映衬；防御；相比；相对
(1) 表示“反对”“对着”“违反”“不利于”等。如：
We are all against his idea. 我们都反对他的想法。
He was married against his will. 他结婚是有违本意的。
(2) 表示“靠着”“顶着”“迎着”“衬着”等。如：
He stood with his back against the door. 他背靠门站着。
He hit his head against the window. 他的头撞到了窗户上。
注意 against 是介词，不是动词。如：
例句：他靠在树上。
正：He leaned against the tree.
误：He against the tree.
因为against是介词，所以后接动词时要用动名词。如：
我反对在警察到达之前采取任何行动。
正：I’m against doing anything till the police arrive.
误：I’m against to do anything till the police arrive.
