22. It is suggested that he ______ earlier than usual to catch the early bus.A. must leaveB. leaveC. will leaveD. leaves

步骤 1：理解句子结构
句子的主干是"It is suggested that he ______ earlier than usual to catch the early bus."，其中"It is suggested that"是一个固定结构，表示建议。
步骤 2：分析从句的谓语动词
在"It is suggested that"结构中，从句的谓语动词通常使用虚拟语气，即"should + 动词原形"，其中"should"可以省略。
步骤 3：选择正确的选项
根据上述分析，从句的谓语动词应为"leave"，且"should"可以省略，因此正确答案为B选项。