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【单选题】

These pens are _____sale, and you'd better buy some.

[ ]

A.
on
B.
in
C.
of
D.
to
举报
参考答案:
参考解析:
.
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举一反三

【单选题】The room is too small for us . [ ]

A.
to live in
B.
living
C.
live in
D.
to living in