单项选择题

The director ordered that the gate and windows （） firmly before leaving the office.

A.ought to be closed
B.be closed
C.shall be closed
D.must be closed

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It is more important for the company to give the creative members the chance to explore creative approaches and ideas （）constrict .

A.other
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In the electronic governor actuator, the oil pressure is provided by a （）pump driven by a shaft connected to the engine camshaft。

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C.gear
D.volute
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