单项选择题
A.was first found B.was first discovered C.has first been discovered D.was seen first
Before she left on the trip, she（） hard.A.trainedB.has ...
单项选择题Before she left on the trip, she（） hard.
A.trained B.has trained C.would trained D.had trained
You（）to lock the door at night.A.should B.oughtC.must...
单项选择题You（）to lock the door at night.
A.should B.ought C.must D.shall
-- Hello, could I speak to Don please? --（）A.Who are yo...
单项选择题-- Hello, could I speak to Don please? --（）
A.Who are you B.What’s the problem C.Are you Jane D.Who’s speaking?
