什么情况下remain后加done 和to do?

In April,thousands of holidaymakers remained abroad due to the colcanicash cloud
A. sticking B.stuck C.to be stuck D.to have stuck
It remains whether Jim'll be fit enough to play in the finals.
A.seen B.to be seem C.to be seen D.to see
为什么前者选B后者选B

1. In April, thousands of holidaymakers remained (stuck) abroad due to the volcano cash cloud.
remain stuck, get stuck
行程受阻

2. It remains (to be seen) whether Jim'll be fit enough to play in the finals.
还有待人们拭目以待
remains to be seen,后面所说的事还要人去看,事被看
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