单项选择题

The machine ______, the next step was how to operate it.

A.having been installed
B.had been installed
C.having being installed
D.has been installed
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单项选择题
Those who want to get the information about flight schedule should ______ at the booking office.
A.acquire
B.request
C.inquire
D.require
单项选择题
We cannot be too careful in checking the safety device of the vehicle, for it s a matter of life and death.
A.我们对车辆装置的检查越仔细越好,因为这是一个生死攸关的问题。
B.我们不能不当心车辆装备的安全性,因为这辆车涉及到生死攸关的问题。
C.我们不能不对车辆的安全装置仔细检查,因为这是一个生死攸关的问题。
D.我们对车辆的安全还是不太小心,虽然他既关系到生者又关系到死者。
E.我们对这辆车的安全装置不必过于仔细检查,但必须重视生死攸关的问题。
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