In 1979 an extensive（）program was in progress throughout Suez Canal.<br>A:a dredge and widen<br>B:dredged and widened<br>C:dredging and widening<br>D:being dredging and widening

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

出自：海船船员证

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