He _______ books for poor children for years.
A. has collected
B. collects
C. is collecting
D. collected
for years: nhiều năm
=> Từ cần điền diễn tả một hành động xảy ra trong quá khứ và kéo dài đến hiện tại nên ta dùng thì hiện tại hoàn thành: has collected
=> He has collected books for poor children for years.
Tạm dịch: Ông đã thu thập sách cho trẻ em nghèo trong nhiều năm.
Đáp án cần chọn là: A
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