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__________, the vitamin C in them will be destroyed.

       A．Vegetables cooked too long                   B．Cooked too long

       C．Cooking too long                                 D．Vegetables cooking too long

________, the vitamin C in them will be destroyed.

　　A．If vegetables are cooked too long

　　B．If cooked too long

　　C．If cooking too long

　　D．If being cooked too long

　　A．If vegetables are cooked too long

　　B．If cooked too long

　　C．If cooking too long

　　D．If being cooked too long