—_______ they _______ the book _______ to the library yet?
—Yes, they have.
| A．Have; returned; / | B．Have; returned; back |
| C．Did; return; / | D．Did; return; back |
—_______ they _______ the book _______ to the library yet?
—Yes, they have.
| A．Have; returned; / | B．Have; returned; back |
| C．Did; return; / | D．Did; return; back |
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