单项选择题

The group of boys had to stop because ______.

A．they had reached the peak
B．one of the boys was badly injured
C．one of the boys was sick
D．they had to return to the hut
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I should ______ him up to tell him the information.
A．call
B．calling
C．called
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When we ______ the museum is not decided.
A．visited
B．visit
C．will visit
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