- 试题详情及答案解析
- It has been proved eating vegetables in childhood helps to protect you against serious illnesses in later life.
| A．if | B．because |
| C．when | D．that |
- 答案：D
- 试题分析：考查主语从句和形式主语。此句中，it为句子的形式主语，而proved后面的从句才是该句的真正主语，即为主语从句。该主语从句中，eating vegetables in childhood helps to protect you against serious illness in later life 并不缺少任何成分，所以只需用that引导即可。if/because都不能用于引导主语从句，排除AB，when表示从句缺少时间状语也不对。句意：童年吃蔬菜有助于晚年健康的观点已经被证实。故选 D。
考点：考查主语从句和形式主语