Native English speakers can understand each other __________ they don’t speak the same kind of English.
#33610
A
as if
B
even if
C
if
D
unless
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—I must apologize for ______ ahead of time. —That’s all right. 
#32100
A
not letting you to know
B
not letting you know
C
letting you know not
D
letting not you know
__________ David could remember, he had never said an angry word to that customer.
#33588
A
As far as
B
As long as
C
As well as
D
As much as