A sentence has been divided into four parts, marked a, b, c and d. Identify that part of the sentence which needs to be changed for the sentence to be grammatically correct.
a. It is essential that diseases like tuberculosis
b. are detected and treated
c. as early as possible in order to
d. assure a successful cure.
Explanation:
'Assure' is an intransitive verb and should be followed by an object. The correct usage here would be 'be sure of'.
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