(ক) It is raining from morning.
(খ) It has been raining from morning.
(গ) It has been drizzling since morning. √
(ঘ) It is drizzling since morning.
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(ক) It is raining from morning.
(খ) It has been raining from morning.
(গ) It has been drizzling since morning. √
(ঘ) It is drizzling since morning.