800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 4

In these areas, there is no limestone in the rocks to neutralize the acid rain naturally. One remedy is to pump limestone into the acidic lakes. (4)_________, it is not possible to do this on

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In these areas, there is no limestone in the rocks to neutralize the acid rain naturally. One remedy is to pump limestone into the acidic lakes. (4)_________, it is not possible to do this on a large enough scale to save all the lakes.

However

Moreover

So

Because

Giải thích

A là đáp án đúng