题目
题型:不详难度:来源:
Scientists ______ SARS for several months before a major discovery was made in the field.
A.had been studying | B.have been studying |
C.have studied | D.are studying |
答案
解析
核心考点
试题【Scientists ______ SARS for several months before a major discovery was made in t】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
A.proved to | B.proved us | C.was proved | D.proved |
Some teenagers _______ their health because they often expose themselves to so many electric products.
A.have damaged | B.are damaging | C.damaged | D.will damage |
30. The subway __________in our city, and I’m sure there will be fewer traffic jams in the future.
A.is building | B.is built | C.is being built | D.will build |
What I said and did at your house last night_________just between you and me.
A.is | B.are | C.have been | D.had been |
The price_________recently. I wonder whether it will remain so.
A.was going up | B.went up | C.has gone up | D.has been going up |
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