( 34 ~ 36 )        When you go into a supermarket, in front of you are tens of thousands of products. Each of them has a differentprice. When you are ready to pay, how do the clerks know the prices right away? It’s simple. They use barcodes andscanners to quickly get a price.        Before barcodes and scanners were invented, business people knew they needed something like them verymuch. In 1932, a business student named Wallace Flint got a crazy idea: when people did their shopping, they justneeded a card and marked __( 34 )__ on it. At checkout, the only thing they needed to do was to put the card into amachine, and what they__ ( 35 )__would be sent to them right away. However, the idea didn’t work out becauseexpensive machines were needed. Though this idea sounded crazy then, it showed what was to come.        In 1948, Bernard Silver heard a businessman __( 36 )__ to get product information at checkouts. After he toldhis friend Norman Joseph Woodland about it, the idea interested Woodland. They tried many ways and created thefirst barcode. Finally, they also invented a scanner. Since then, the barcodes and scanners have changed the waypeople check out at a supermarket.
【題組】34.
(A) they had planned to buy
(B) that they planned to buy
(C) which they had planned to buy
(D) what they planned to buy