I would say neither. "I suggested that we could leave earlier" or "I suggested we leave earlier"
2020年2月2日
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These forms look like "reported speech- questions". For example if you have a question "Can we leave earlier?" then reported speech of that would be "I asked if/whether we could leave earlier".
2020年2月2日
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You say "I suggested that we should leave earlier." or "I suggested that we leave earlier.".