Mike and I _______ net-friends. We talk on-line every week.
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A
am
B
was
C
are
D
is
推荐题目
We all know that learning a foreign language _______ time and effort.
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A
requires
B
reduces
C
removes
D
repeats
- In our school library, there____ a number of books on science and the number of them ______ growing larger and larger.
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A
is, are
B
has, are
C
have, is
D
are, is