730点 文法問題 接続・前置詞 at the beginning of TOEIC Part 5 練習問題 P5_534 The new policy will take effect ------- the beginning of next month. A. at B. in C. to D. on ✅ 正解：at ✅ 正解根拠:at the beginning of は定型。 🎯 秒解きポイント:at the beginning of。 文法問題 接続・前置詞 at the beginning of