-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.
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A
have worked
B
worked
C
will work
D
have been working
推荐题目
Mr. Smith ______ the grammar book meant for senior high school students and will almost finish it.
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A
was writing
B
has written
C
has been writing
D
has been written
—Wow,your picture looks splendid!—I______it on my computer.
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A
drew
B
draw
C
will draw
D
had drawn
(2014·日照模拟)The young man was modest and worked hard，and gradually managed to________his status.
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A
take up
B
bring up
C
build up
D
put up
To our great disappointment, a lot of jobs ______ if the factory closes.
#101131
A
will lose
B
will be lost
C
are lost
D
lost