单项选择题
He（）when the door opened and the manager came in.
A.was smilingB.smiledC.is smilingD.has smiled
单项选择题 Which river is （）shortest，the Nile，the Amazon，or the Mississippi？
单项选择题 I’ve a lot of（）to do during the holiday.
判断题 Minors can appoint an agent without court approval.（）
