________he can't understand is ________his son doesn't like the school.He is very upset about this.
| A．That；why | B．Why；that |
| C．What；why | D．Whether；that |
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________he can't understand is ________his son doesn't like the school.He is very upset about this.
| A．That；why | B．Why；that |
| C．What；why | D．Whether；that |
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