— Food problem is becoming a big one in China!
—I think the food ________ before going to shops or supermarkets.
| A．is checked | B．is checking |
| C．should be checked | D．should check |
— Food problem is becoming a big one in China!
—I think the food ________ before going to shops or supermarkets.
| A．is checked | B．is checking |
| C．should be checked | D．should check |
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