单项选择题

The owner of the store （） his floor when I walked in.

A．is sweeping
B．sweeps
C．was sweeping
D．swept

相关考题

—— Mary, thanks very much for your help. —— （）. Have a...

单项选择题

—— Mary, thanks very much for your help.
—— （）. Have a good day.

A．It’s OK
B．It’s my pleasure
C．Nothing particular
D．No problem