IT WAS A VERY LONG VOYAGE. WE WERE______ SEA FOR 50 DAYS. A. AT...
121. It was a very long voyage. We were______ sea for 50 days.
A. at B. by C. in D. on
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121. It was a very long voyage. We were______ sea for 50 days.
A. at B. by C. in D. on