No matter how scientists are eager to know more about it by exploring.A. an ocean may be

问题补充：

No matter how ，scientists are eager to know more about it by exploring.

A. an ocean may be deep

B. deep may an ocean be

C. deep an ocean may be

D. may an ocean be deep

答案：

A. an ocean may be deep

B. deep may an ocean be

(答案→)C. deep an ocean may be

D. may an ocean be deep

解析：考查句型，no matter how应当紧跟形容词，排除AD,后面要用陈述语序，因此选择C

句意为，无论海洋有多么深，科学家都很急切想通过探索知道更多关于海洋的东西。