. Mark took many trips to Asia since he started his own import-export business. A B C D
2 câu trả lời
took` ->` has taken
S+(HTHT)+ since+khoảng Time+S+V(QKĐ)
Vì vế sau có "he started" `->` Vế trước chia HTHT
took -> has taken
thì HTHT + since : s + have / has + vPII + since + 1 mốc thời gian / thì QKĐ
dấu hiệu nhận bt : since
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