【正确答案】The tram was so crowded that there was scarcely sufficient room for you.

【答案解析】副词hardly和scarcely虽然都含有“几乎不”等否定含义，但在某些情况下是不能互换的，如在强调数量“不足”时只能用scarcely，这时它常与enough、sufficient等词连用。