The new discovery _______ be of great service to mankind.
- A. is bound to
- B. is bound for
- C. be bound to
- D. be bound for
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正确答案： A
本题解析：
be bound to：注定要，一定会。本题中主语是 The new discovery ，所以谓语动词要用is。句意：这项新发现对于人类必定大有用处。
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