These animals are in danger．We should think ______ to protect them．
| A．how we can do | B．how can we do |
| C．what we can do | D．what can we do |
These animals are in danger．We should think ______ to protect them．
| A．how we can do | B．how can we do |
| C．what we can do | D．what can we do |
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