单项选择题

The director __________their representatives is to attend the conference.（）

A．or
B．and
C．as well as
D．rather than

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单项选择题

White smoke __________25～30meters above the hill as they approached it.（）

A．has been seen rise
B．had been seen rising
C．was seen rise
D．was seen rising

单项选择题

The exciting work was good for me as it got my blood__________agreeably through my veins.（）

A．circulating
B．floating
C．hunting
D．orbiting