In the question below, a part of the sentence is underlined. Below are given alternatives to the underlined part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose 'No improvement.' Sarah was expelled because she was misbehaving for the past one month. ?

Option 3 : Had been misbehaving

The correct answer is Optio 3 i.e Had been misbehaving

[ alt="clipboard" src="//storage.googleapis.com/tb-img/production/20/08/clipboard.png" style="width: 40px; height: 40px; float: left;">Explanation

Look at the given sentence we find that:

• The sentence comprises of two actions that happened in the past.
• Her misbehavior was a past action that was happening for a stretch of time (in this case, one month) before she was expelled.
• Thus, was misbehaving must be replaced by had been misbehaving.
• The past perfect continuous tense is used to express an action that occurred over a period of time before another action that also happened in the past. 

Hence here we find that the correct answer is Option 3 Had been misbehaving. 

Thus the correct sentence will be: 'Sarah was expelled because she had been misbehaving for the past one month. '