题目

30．The coach, because of the driver’s carelessness, was __________ and crashed over the cliff on such a cold December morning. A．in support B．out of control     C．in chargeD．at the mercy 答案：B 解析: out of control意为“失去控制”；A项意为“支持”；C项意为“负责；掌管”；D项意为“任凭……的摆布（而无力保护自己）”。