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Joe has finished his frist-aid course. He proves extremely helpful as a rescue worker

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Joe has finished his frist-aid course. He proves extremely helpful as a rescue worker.

Although Joe proves extremely helpful as a rescue worker, he hasn’t finished his first-aid course.

Without finishing his first-air course, Joe proves extremely helpful as a rescue worker.

However helpful Joe proves as a rescue worker, he hasn’t finished his first-aid course.

Having finished his first-aid course, Joe proves extremely helpful as a rescue worker.

Giải thích

Chọn đáp án D

Câu D là câu có 2 mệnh đề, trong đó mệnh đề phụ đã được rút gọn chủ ngữ.