--- Let’s hurry. The President is coming.

--- Oh, I was afraid that we ________.

A．already miss him

B．had already missed him

C．will miss him already

D．have already missed him

下列实验方案或操作中，正确的是[ ]

A．用稀硫酸除去铁粉中的铜粉

B．用稀盐酸洗涤试管内壁的油污

C．实验时多取的白磷可以放回原瓶

D．按溶解、过滤、洗涤、蒸发结晶的操作顺序可以分离氯化钾、二氧化锰的混合物