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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Warmth, moisture and oxygen are three necessary requirements____________ most seedlings.
A. for cultivating
B. for cultivate
C. as cultivating
D. can cultivate
Warmth, moisture and oxygen are three necessary requirements____________ most seedlings.
A. for cultivating
B. for cultivate
C. as cultivating
D. can cultivate
Giới từ "for" + V_ing
Đáp án A.