I first met Mr. Smith in America. He ___

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问题选择题

I first met Mr. Smith in America. He ______ at Stanford University then.

A．studied

B．has studied

C．is studying

D．was studying

答案

答案：D

由关键词：then推出过去进行时。

选择题

---I think _______ask Tim for some advice.

---_______. Last time when I turned to him, he refused to help.

A．you'd rather; I think so

B．you'd better; I'd rather not

C．you have to; I'd rather not

D．you'd better; I think so

单项选择题

诊断中毒主要依靠（）

A.毒物接触史

B.临床表现

C.毒物分析

D.接触史+毒物分析

E.接触史+临床表现