I wonder whether I …….. ever see him again.

The correct answer is: D. would

The modal verb “would” is used to express uncertainty or speculation about the future. In this case, the speaker is wondering whether they will ever see the person again. They are not sure, so they use the modal verb “would” to express their uncertainty.

The other options are not correct because they do not express uncertainty. The modal verb “shall” is used to express obligation or necessity. The modal verb “will” is used to express certainty or prediction. The modal verb “should” is used to give advice or make a suggestion.

Here are some examples of how the modal verb “would” can be used to express uncertainty:

• I wonder if I would ever see him again.
• I’m not sure if I would ever see him again.
• I doubt if I would ever see him again.
• I don’t think I would ever see him again.
• I’m afraid I would never see him again.

I hope this helps!