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
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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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