Joy _______ as a language teacher in China for two years before she went back to London.
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A
had worked
B
was working
C
worked
D
has worked
推荐题目
By the time these books were published,  he _____ addicted to them.
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A
had become
B
becomes
C
has become
D
became
If we use the new recycling method, a large number of trees         .
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A
are saved
B
will save
C
will be saved
D
have saved
When Mary came, I _____ on the piano.
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A
is playing
B
plays
C
was playing
D
played