A：It's no trouble at all.
B：That's good.
C：I don't think it's a trouble.
D：That's very kind of you.
A.of
B.at
C.on
D.in
A.had been
B.might be
C.might have been
D.would be
A.similar; familiar
B.similar; similar
C.familiar; similar
D.familiar， familiar
A.by the way
B.in a row
C.in the way
D.in aline
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