彼は明日来る___です。 (He should be coming tomorrow.)

Answer and explanation

Correct answer: B. はず

はず expresses an expectation based on reason.
Answer: はず.
Why not the others: ところ: ところ means about to. ほど: ほど means extent. ため: ため means purpose or cause.

Practise more Expressions.

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彼は明日来る です。 (He should be… | JLPT Practice (N5 and N4) - Japan