Use the past perfect continuous tense form of the verb in the following sentence:

James had lost weight because he ____ very rigorously.

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Was exercising

Had exercise

Had been exercising

Was being exercised

answer is C.

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Detailed Solution

Concept: The past perfect continuous form of any kind of verb is done by adding 'had been' to the base verb + ing. The verb present in the given question is 'to exercise'; for which the base/ root form is simply 'exercise'.
After applying the above, we clearly get 'had been exercising', which is in option 3. This option 3 is the correct answer.
Option 1: It is simply past continuous tense. So, this is an incorrect option.
Option 2: It is past perfect. So, this is an incorrect option.
Option 4: It is also a form of past perfect continuous, but this doesn't fit in with the rest of the given statement. So, this is an incorrect option.
Hence, the correct answer is option 3.

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