摘要：33．The experts the research report to the board for approval． A．polished B．covered C．published D．submitted
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Many experts hold the view ____teacher development is _____the key to better education lies.
- A.which, where
- B.which, in which
- C.that, where
- D.that, in which
Some experts advise that steps ________ to protect the river at once, otherwise it's dangerous for people to drink the water.
- A.being taken
- B.be taken
- C.were taken
- D.had been taken