问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C