单选题In 1979 an extensive（）program was in progress throughout Suez Canal.Aa dredge and widenBdredged and widenedCdredging and wideningDbeing dredging and widening
单选题
In 1979 an extensive（）program was in progress throughout Suez Canal.
A
a dredge and widen
B
dredged and widened
C
dredging and widening
D
being dredging and widening
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