单项选择题

The crewman switched on portable flashlights as the engineer __ the scene.

A．has surveyed
B． surveys
C．was surveying
D．is surveying
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单项选择题
Henry and Tom __ to the parties at the Trade Union every Saturday.
A． used to go
B．were used to go
C．are used to go
D．use to go
单项选择题
_______ the size and nature of a business, its main goal is to earn a profit.
A．Whatever
B．Whichever
C．Whereas
D．Because
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