Question
Each of the following sentences has been divided into
five parts (a), (b), (c), (d) and (e). One of these parts may contain a grammatical or contextual error. Identify the part that contains the error. If there is no error, choose option (e). The historian rarely acknowledges opposing viewpoints (a), / even when presented with strong archival evidence (b),/ which challenges his long-held assumptions (c),/ doesn’t he (d)?/  No error (e)Solution
Explanation: The sentence is: The historian rarely acknowledges... This is in the Simple Present Tense. For a simple present statement with a singular subject (The historian), the auxiliary verb is does. ·        "Rarely" makes the statement negative . ·        A negative statement requires a positive tag . ·        The positive tag for "acknowledges" is "does he?" .
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