Do you know two straight lines which _______ at a point _______ an angel?
A. met-formed
B. have met-have formed
C. meet-have formed
D. meet-form
KEY: D
Giải thích: câu này nói về một sự thật hiển nhiên nên chia hiện tại đơn.
Dịch: Bạn có biết rằng 2 đường thẳng cắt nhau tại một điểm sẽ tạo thành một góc?
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