题文
I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
| A．what it is | B．what it does |
| C．what is it | D．why is it |
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I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
| A．what it is | B．what it does |
| C．what is it | D．why is it |
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