the open window前加against还是through

答案：B．考查介词．句意"他爬上靠在墙上的梯子，穿过敞开的窗户进入房间．"．第一个空，表示靠在某物上用against紧靠着…第二个空，表示穿过窗户，穿过物体内部，用through穿过．答案是B．

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