题目
题型：专项题难度：来源：
B. have been working
C. worked
D. had worked
答案
核心考点
试题【We _____ on this project for four hours. Let"s have a rest. [ ]A. are workin】；主要考察你对过去将来完成时等知识点的理解。[详细]
举一反三
— Not yet, but we ______ to get in touch with her ever since she left us.
[ ]
B. tried
C. are trying
D. have been trying
— Sorry. I _____ a letter all the morning and haven"t finished it yet.
[ ]
B. was writing
C. have written
D. have been writing
[ ]
B. have tired
C. had tired
D. have been trying
[ ]
B. is preparing
C. had prepared
D. has been preparing
[ ]
B. have… been doing
C. did…do
D. are…going to do
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