—He looks unhappy.—Yes,but he can’t say what it is_______is bothering him.
#85421
A
as
B
that
C
what
D
which
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—What was it that caused the party to be put off?—________ the invitations.
#84745
A
Because Tom delayed sending
B
Tom delayed to send
C
That Tom delayed sending
D
Tom delayed sending
I’ve already forgotten    you bought the dictionary.
#84731
A
that it was when
B
that was it when
C
when was it that
D
when it was that