Answer-When he looked back, (A)/the professor understood that (B)/he spent most of his life to teach (C)/at...

Here, instead of lsquoto teachrsquo, the gerund lsquoteachingrsquo should be u sed. When he looked back, the professor understood that he spent most of his life teaching at the middle school.

Question

When he looked back, (

A /the professor understood that (
B /he spent most of his life to teach (
C /at the middle school (
D .

Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any).

A When he looked back

B the professor understood that

C he spent most of his life to teach

D at the middle school

E No error

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