People ____ more and more useful things to protect the earth since Earth Day was started.
| A．did | B．were doing |
| C．will do | D．have done |
相关试题
I think there will be more
in big cities.
| A．pollution | B．policeman | C．population | D．prediction |
People ____ more and more useful things to protect the earth since Earth Day was started.
| A．did | B．were doing |
| C．will do | D．have done |
I think there will be morein big cities.
| A．pollution | B．policeman | C．population | D．prediction |
for Hong Kong next Wednesday.
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