彼___の計画だ、うまくいくはずだ。
The correct answer is **のことだから (no koto dakara)**. This pattern is used to explain a natural characteristic or tendency of a person (or sometimes a thing), implying that because of who or what they are, a certain outcome is expected or natural. 「彼のことだから」 means "Because it's him (and we know his character/abilities), it's natural that..." suggesting that success is expected due to his reliability or skill. **のことか (no koto ka)** would form a question meaning "Is it about X?" or express doubt/surprise, which doesn't fit the context of predicting success. **のことなら (no koto nara)** means "if it's about X" or "when it comes to X," introducing a topic or a conditional statement (e.g., 「彼の事なら何でも知っている」 - If it's about him, I know everything). It implies a condition, not a reason for an expectation. **のことには (no koto ni wa)** is not a standard grammar pattern used to express "because it's X." While parts like 「~のこと」 or 「~には」 exist, their combination doesn't form this specific meaning.
正解は「のことだから」です。「~のことだから」は、ある人や物事の性質や傾向から、当然予想される結果を述べる際に使います。「彼のことだから」で、彼の人柄や能力を知っているからこそ、計画がうまくいくはずだという期待を表します。 「のことか」は疑問や驚きを表し、文脈に合いません。 「のことなら」は「~についてなら」という条件を示し、「彼のことなら何でも知っている」のように使います。 「のことには」は一般的な文法パターンではありません。
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