He how to dance when he six years old. A. knows / was
B. has known/was
C. knew/ was
D. knows / is

A. Knows / was past tense

B

Explanation:

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He has known how to dance when he was six years old.

that is the way of a cheater and cheaters get nothing but bad grades and in trouble.

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !