🧵 接続詞 ・ アオイ
TOEIC Part5文法問題 アオイ: Q60（接続詞）
Employees may not enter the laboratory ___ they wear protective equipment.
Employees may not enter the laboratory ___ they wear protective equipment.
答えを見る
正解: A) unless
The meaning is 'employees may not enter unless they wear protective equipment' — a negative condition. The conjunction 'unless' (meaning 'if not') fits. 'If' would reverse the logic, implying entry is blocked if they do wear equipment. 'Because' shows reason and 'so that' shows purpose — neither expresses a condition.