It is raining since morning.
It has been being raining since morning.
It has been raining for morning.
It has been raining since morning.
Source: ১৩ তম বেসরকারি প্রভাষক নিবন্ধন পরীক্ষা (13-05-2016)
Answer: It has been raining since morning.
Explanation:
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