题文
The supermarket rules state that no goods ________ be taken out of the supermarket, ________ paid for by the shopper.
| A．must; once | B．should; when |
| C．can; if | D．shall; unless |
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The supermarket rules state that no goods ________ be taken out of the supermarket, ________ paid for by the shopper.
| A．must; once | B．should; when |
| C．can; if | D．shall; unless |
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