Câu hỏi:
19/07/2024 186Ecologists 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.
(A) To preserve
(B) For
(C) The ozone layer
(D) Have planted
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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