第18题: [单项选择]属于高温、高湿作业的是() A. 轧钢 B. 铆钉 C. 露天搬运 D. 井下采煤 E. 造纸 参考答案:E
第19题: [单项选择]The secretary had the messenger ______ the envelope as soon as possible. A. (A) delivering B. (B) to deliver C. (C) deliver D. (D) delivered 参考答案:C 答案解析:Deliver is the correct form of the verb after the causative verb had. Choice (A) is the present part