_____ the flight to New York will be delayed is ____ I'm especially worried about.
#79409
A
If; what
B
Whether; that
C
When; that
D
Whether; what
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Einstein’s most famous theory is ______ we call the Theory of Relativity.
#79438
A
what
B
that
C
which
D
why
I'm afraid he’s more of a talker than a doer, which is ____ he never finishes anything．
#79486
A
that
B
when
C
where
D
why
He is going to build a team that has a lot of potential and he thinks that is excites him.
#79473
A
that
B
which
C
what
D
as