________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
| A．What | B．It |
| C．As | D．Which |
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________ is known to all is that effective measures should be taken to deal with the problem of the overexploitation of our resources.
| A．What | B．It |
| C．As | D．Which |
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