The boy was not intelligent enough to have solved such complex problems alone

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Select the sentence that is close to the given sentence:

The boy was not intelligent enough to have solved such complex problems alone

The complex problems couldn’t be solved because the boy was so stupid.

The boy was not intelligent but he managed to solve such complex problems

The boy, though quite intelligent, couldnt solve the complex problems

The boy together with someone else solved the complex problems

Giải thích

Đáp án : D

(Not) be + adj + enough + to V = (không) đủ … để làm gì. Cậu ta không đủ thông minh để giải quyết vấn đề một mình -> cậu ta cùng với người khác mới giải quyết được