题目
After patient observation, we why the bridge was sinking.A. cleaned upB. built upC. found outD. took out
After patient observation, we why the bridge was sinking.
A. cleaned up
B. built up
C. found out
D. took out
题目解答
答案
C. found out
解析
本题考查动词短语的辨析，核心在于理解句子逻辑关系。关键点在于“patient observation（耐心观察）”与后续动作的连贯性。需明确每个选项的含义及适用场景，尤其注意固定搭配的使用。
选项分析
A. cleaned up
意为“清理、整顿”，与“观察后得出结论”无关，排除。
B. built up
意为“建立、增强”，无法表达“通过观察查明原因”，排除。
C. found out
意为“查明真相、发现事实”，符合“通过观察得出桥下沉原因”的语境，正确。
D. took out
意为“取出、拿出”，与观察结果无关，排除。