把意思相近的成语连起来。

眼高手低                  过河拆桥                           瓜熟蒂落                 独木难支

卸磨杀驴                  口蜜腹剑                           孤掌难鸣                 转危为安

笑里藏刀                  得寸进尺                           聚沙成塔                 水到渠成

得陇望蜀                  志大才疏                           化险为夷                 集腋成裘

______ at the door before you enter my room, please.

A．Knock

B．Knocking

C．Knocked

D．To knock