Joe was an excellent swimming before,he ( )用适当的情态动词swim across the river.原因呢

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Joewasanexcellentswimmingbefore,he()用适当的情态动词swimacrosstheriver.原因呢Joewasanexcellentswimmingbefore,he

Joe was an excellent swimming before,he ( )用适当的情态动词swim across the river.原因呢
Joe was an excellent swimming before,he ( )用适当的情态动词swim across the river.
原因呢

Joe was an excellent swimming before,he ( )用适当的情态动词swim across the river.原因呢
Joe was an excellent swimming before,he ( could)swim across the river.