—You didn’t come to the meeting yesterday afternoon, did you?

—No, I ________ at the station for my uncle from Beijing.

A．was waiting

B．have waited

C．am waiting

D．will wait

要除去一瓶空气中的氧气而不产生新的气体，应选用

①红磷；②木炭；③铝箔；④铁丝；⑤硫磺；⑥石蜡[ ]

A．只有①

B．①③④

C．①⑤⑥

D．①②③④