It will take _____ years to make robots _____ the most unpleasant things .
| A．hundred ; to do | B．hundreds of ; to do |
| C．two hundreds; do | D．hundreds of ; do |
It will take _____ years to make robots _____ the most unpleasant things .
| A．hundred ; to do | B．hundreds of ; to do |
| C．two hundreds; do | D．hundreds of ; do |
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