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【简答题】
判断生活中常见机械及部件的机构类型。 雷达( )机构
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皮皮学刷刷变学霸
举一反三
【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
【单选题】I don’t smoke now, but I ____for almost ten years.
A.
ever smoked
B.
have ever smoked
C.
had ever smoked
D.
was ever smoking
【简答题】A． still B． even C． ever D． almost
【单选题】I don’t drink now, but I ________ for almost ten years.
A.
ever drank
B.
was ever drinking
C.
have ever drunk
D.
had ever drunk
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