该句逗号是否使用正确：One of the main challenges encountered by the refining industry worldwide, is the deterioration in feedstock quality and the introduction of heavy crude oils.
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- 该句逗号是否使用正确：One of the main challenges encountered by the refining industry worldwide, is the deterioration in feedstock quality and the introduction of heavy crude oils. A: 正确 B: 错误
- One thing is certain, as the competition increases, worldwide reputation for quality and service will _____ for a company.
- 判断该句说法是否正确。 句号、问号、叹号、逗号、顿号、分号、冒号都属于点号
- One main purpose of a speech of introduction is to __________.
- 请判断该句是否正确：¿Cuánto lo debo a usted? A: 正确 B: 错误