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, ?
用 À、DE，还是不加介词？
NowTCFCA Learning Workspace
TCFCA Learning Workspace
On desktop, the sentence list follows the current line while you play; on mobile, the page stays in place so you can keep watching the video.
On desktop, the current line stays in view automatically. Mobile keeps its position so the video stays visible.
Each segment is clickable. The blue cursor follows the video; saved lines are marked in gold.
, ?
用 À、DE，还是不加介词？
Now!
该你告诉我答案了！
?
你还记得这件事吗？