A.did not interrupt
B.were not interrupted
C.had not interrupted
D.had not been interrupted
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A.hand it over
B.take it over
C.carry it over
D.carry it out
A.help
B.good
C.use
D.worth
A.to keeping you
B.to kept you
C.to have kept you
D.kept you
A.will do
B.has done
C.had done
D.will have done
A.have had
B.had have
C.had had
D.would have had
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（） is not installed on the main switchboar.
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