E-books ______ in the 1990s.

A.appear
B.appeared
C.was appeared
D.have been appeared
B
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科目:初中英語 來源:0101 期中題 題型:單選題

E-books ______ in the 1990s.
[     ]
A.appear
B.appeared
C.was appeared
D.have been appeared

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