I’m not sure when ______________ the book ______________ the library.
| A．to return; back to | B．returning; back to |
| C．to return; to | D．will return; to |
I’m not sure when ______________ the book ______________ the library.
| A．to return; back to | B．returning; back to |
| C．to return; to | D．will return; to |
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