A : ______ in the book? B : ______ a bookmark.
| A．Where's ; It's |
| B．What's ; It's |
| C．What ; This's |
| D．Where's ; At |
A : ______ in the book? B : ______ a bookmark.
| A．Where's ; It's |
| B．What's ; It's |
| C．What ; This's |
| D．Where's ; At |
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