摘要： when
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When a contractor is ready to begin construction of asuperhighway, he makes a preliminary study of the drawings andblueprints supplied by the engineers. He gains mental picture. of the whole jobbefore he begins actual construction.
- A.preparatory
- B.extensive
- C.scientific
- D.necessary
When you have finished the book, please ________ it on the shelf．
- A.replace
- B.take place
- C.take place of
- D.in place of
When ________, the museum will be open to the public next year.
- A.completed
- B.completing
- C.being completed
- D.to be completed