单项选择题

The tremendous heat at a star's core,______ tremendous gravity, joins the nuclei of hydrogen atoms.

A．combined with
B．having combined with
C．combining with
D．being combined to
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单项选择题
It is true that road travel in the old days was difficult,______ and uncomfortable, but it was comparatively safe.
A．tedious
B．irritable
C．worrying
D．disinteresting
单项选择题
The young soldier killed 25 enemies in a close battle, for which he was______ the title of Combat Hero.
A．awarded
B．rewarded
C．conferred
D．honoured
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