Mary, stop to have a rest. You _________ the flowers in your garden for nearly two hours.

A．are watering

B．were watering

C．water

D．have been watering

人人都知道股市波涛汹涌、风云变幻，但有些人还是幻想能赚到股市中的最后一分钱。股海淘金，需要仔细权衡投资的[ ]

A、股票价格、预期股息、银行利息税

B、价值尺度、流通手段、贮藏手段

C、安全性、收益率、流通性

D、信用度、保障范围、赔付标准