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
I don' t think I'd like to share a flat with her. I'd find it difficult to______ her standards of order.
A．live up to
B．keep up to
C．face up to
D．make up to
单项选择题
He is off to Paris again tomorrow. He tells me that, with this journey, he______ there and back twenty times.
A．will be
B．will have been
C．will go
D．will have gone
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