_____ the desalination plant, the company could offer an effective solution to the problem of water scarcity.
Đáp án đúng là: B. Having built
Giải thích:
Ta dùng 'Having built' để diễn tả một hành động đã hoàn thành trước một hành động khác trong quá khứ. Trong trường hợp này, việc xây dựng nhà máy khử muối đã xảy ra trước khi công ty có thể cung cấp giải pháp.
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