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【简答题】
何谓混凝土的?有何特点?影响因素有哪些?
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Don't throw your things everywhere. _____. [ ]
A.
Put it away
B.
Put away them
C.
Put away it
D.
Put them away
【单选题】—It’s _________ useful dictionary and you can’t throw it away . —Thank you . I didn’t know it before .
A.
a
B.
an
C.
the
D.
不填
【单选题】She did not throw away the stockings until they were so ______ that they couldn't be mended anymore.
A.
wearing off
B.
worn out
C.
wearing out
D.
worn off
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