My father insisted that every minute ________ made full use of ________ the work well.
| A．be；to do | B．has been；doing |
| C．be；doing | D．has been；to do |
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My father insisted that every minute ________ made full use of ________ the work well.
| A．be；to do | B．has been；doing |
| C．be；doing | D．has been；to do |
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