单项选择题

Nowadays Internet enables us to know things happen almost at the exact moment ______ .

[A] which they are happening
[B] they are happening
[C] which they happen
[D] they have happened
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单项选择题
The opportunity ______ in a prestigious corporation is a dream for the graduates nowadays in many countries.
[A] to work
[B] working
[C] worked
[D] to be working
单项选择题
No one can be ______ calm when facing with a great danger.
[A] very
[B] so
[C] too
[D] enough
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