Câu hỏi:
18/06/2019 10,532Ecologists are trying to preserve our environment for future generations by protecting the ozone layer, purifying the air, and have planted the trees that have been cut down.
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Trả lời:
Đáp án D => planting
các động từ theo sau “by” được nối với nhau bởi “and” nên được chia Ving giống nhau (protecting, purifying)
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