17.(A). These boxes aren’t heavier than those.

　　(B). The boxes he sold us are too heavy.

　　(C). We thought the boxes would be lighter.

　　(D). He told us to get the heavier boxes.

　　18.(A). They hadn’t predicted it would now.

　　(B). The snow kept some people home.

　　(C). More people attended when it snowed.

　　(D). It didn’t snow, so attendance was poor.

　　答案与音频文本：

　　CB

　　17. These boxes are heavier than he told us they would be.

　　18. More people would have attended if it hadn’t snowed.