is it enough to have survived for a long timeit is enough to do (动原) 但这是现完 这不科学

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is it enough to have survived for a long timeit is enough to do (动原) 但这是现完 这不科学
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is it enough to have survived for a long timeit is enough to do (动原) 但这是现完 这不科学
is it enough to have survived for a long time
it is enough to do (动原) 但这是现完 这不科学

is it enough to have survived for a long timeit is enough to do (动原) 但这是现完 这不科学
后面的时间状语是 for a long time,是一段时间,相对应的时态就应该是完成时,那么回到句中就是to + 完成时

这足以存活一段时间吗?

活了这么长时间足够了吗?

for a long time,是一段时间,

is it enough to have survived for a long time

这些可以存活很长时间了吗 ?