It’s hard ______ that he has failed the Math test.Đoạn văn6/22It’s hard ______ that he has failed the Math test.believing believe to believe believedGiải thíchĐáp án đúng: C It’s + adj + to V Dịch: Thật khó tin là anh ấy đã trượt bài kiểm tra Toán.