
why there is no question mark in this sentence and there is comma at the beginning?

No question mark is needed here since its role is played by the interrogative particle 「か」.
The comma after 「は」 indicates a pause, I believe. I think, it could be safely omitted.

@CK
Please, don't be strict about sentence ownership rule, because:
- Everyone makes mistakes in their own language as well;
- Uncertainty about correctness of foreign sentences forces me to ask others to check my doubts (as above) - it brings more members, discussions and correct solutions;
- I can improve adopted sentences as well if they are wrong.
BTW, Thank you sharptoothed!
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