The officer asked him ________ a sharp lookout for the fishi

【名词&注释】

单螺杆泵(single screw pump)、三螺杆泵(three screw pump)、效率高(high efficiency)

[单选题]The officer asked him ________ a sharp lookout for the fishing boats

A. to keep
B. keeping
C. keeps
D. keep

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[单选题]Where ________ you ________?

A. are/be
B. have/be
C. is/be
D. have/been

[单选题]单螺杆泵与三螺杆泵相比( )。

A. 泵缸由橡胶制成，容积效率高
B. 对杂质较不敏感
C. 额定排压较高
D. 属非密封型

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