皮皮学，免费搜题
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【单选题】
听力原文：W: Where can I find some of the socks you advertised on sale? M: Check out the sales rack in the aisle. There's still quite a few left. Q: What does the man suggest the woman do? (6)A.
Stop looking for the socks for he thinks none is left.
B.
Check the sales area.
C.
Ask somebody else.
D.
Stay where she is.
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皮皮学刷刷变学霸
举一反三
【单选题】At the time of the earthquake Jeff was still in his office. He ________ to finish a project before he left for the day.
A.
has tried
B.
had tried
C.
has been trying
D.
had been trying
【简答题】He must finish his homework by today. must调到句首
【简答题】If he (finish)______his work on time, he will go for a picnic with his friends tomorrow.
【简答题】引入批处理系统的目的是为了提高 ____________ 。
【简答题】在分时和批处理系统结合的操作系统中引入了“前台”和“后台”作业的概念,其目的是 。