Early men did not have clocks. They were told time 【S1】______ by the sun and shadows of trees. At first

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问题     Early men did not have clocks. They were told time                          【S1】______
by the sun and shadows of trees. At first time, they used                     【S2】 ______
sticks placed in the ground instead trees. They made                            【S3】______
marks in the ground, and the shadows from the sticks told                     【S4】______
the time of day. Later, men began to use sundials. Some of                    【S5】______
sundials were boxes with sticks cast a shadow. Men were                       【S6】______
able to take the sundial box with them. The mark for noon                     【S7】______
was very important. The sundials always have to face the same                【S8】______
way or the time was wrong. Sundials were good only on sunny                  【S9】______
days, not on cloud days. They were the first kind of clock.                  【S10】______

选项

答案were→were

解析 分析句子结构,发现主语they指代的是前一句中的early men而不是clocks,而本句中谓语动词told的动作只能由人(主语)而不能由后面的sun和shadows发出,因此不能用被动语态,应去掉were。注意本句中的by不表被动,而是表示方式和工具。
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