Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: ক ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2012
Topic: Sentence (বাক্য), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The correct choice for the sentence "He seems to--------since morning." is D) "have been reading." This option utilizes the present perfect continuous tense, which is appropriate here for several reasons.

Firstly, the phrase "since morning" indicates an ongoing action that began in the past and continues into the present. The present perfect continuous tense (have/has been + gerund) emphasizes the duration of this action. Therefore, "He seems to have been reading since morning" suggests that he started reading in the morning and may still be reading now.

In contrast, the other options do not convey this sustained aspect of the activity:
- A) "read" suggests a completed action, which does not fit with the ongoing timeframe indicated by "since morning."
- B) "be reading" implies a current action but does not connect to the specific time frame of the morning.
- C) "have read" indicates a completed action at some unspecified time, again failing to capture the ongoing nature.

Thus, "have been reading" is the most fitting choice, as it effectively communicates that the reading has been happening continuously from morning until now.