题目
题型:不详难度:来源:
. By the year 2020 scientists _____ a lot of research on AIDS.
A.had done | B.do | C.are doing | D.will have done |
答案
解析
核心考点
试题【. By the year 2020 scientists _____ a lot of research on AIDS.A.had doneB.doC.ar】;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.arrived; died | B.had arrived; would lose |
C.arrived; would have lost | D.has arrived; could have lost |
A.wanted; wrote | B.had wanted; was writing |
C.have wanted; wrote | D.wanted; have been writing |
A.to announce | B.is announced | C.is being announced | D.announced |
A.had come, had written | B.came, wrote |
C.come, have written | D.came, had written |
—You’d better not, I ______ the piano then.
A. will be practicing B. am about to practice
am practicing D. practiced
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