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【简答题】
自升式平台的拖航是指: 。 2 、锥型桩靴适合 的海底,平面桩靴适合 的海底。
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皮皮学刷刷变学霸
举一反三
【单选题】They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.
A.
had been working; are still working
B.
had worked; were still working
C.
have been working; have worked
D.
have worked; are still working
【简答题】They _______ on the program for almost one week before I joined them,and now we _______ it as no good results have come out so far. A．had been working; are still working B．had worked; were still wor...
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