题文
People should ______ from ______ down the trees to protect the earth.
| A．be stopped, to cut | B．stop, to cut |
| C．be stopped, cutting | D．stop, cutting |
People should ______ from ______ down the trees to protect the earth.
| A．be stopped, to cut | B．stop, to cut |
| C．be stopped, cutting | D．stop, cutting |
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