His knowledge of the subject was excellent but his classroom performance was_______.
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Answer: A
The sentence uses the coordinating conjunction "but", which is used to introduce a contrast between two clauses.
Let's analyze the structure of the sentence:
- First clause: "His knowledge of the subject was excellent..." (This expresses a highly positive attribute).
- Conjunction: "...but..." (Signals a shift to a contrasting, negative attribute).
- Second clause: "...his classroom performance was _______." (Must express a negative attribute to contrast with "excellent").
Now let's evaluate the given options:
- A. extremely poor: Negative tone. This perfectly contrasts with "excellent".
- B. good: Positive tone. Does not provide a contrast.
- C. desirable: Positive tone. Does not provide a contrast.
- D. praiseworthy: Positive tone. Does not provide a contrast.
Thus, extremely poor is the only option that logically completes the contrast introduced by "but".
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