B. 改错
　　1. The senior librarian at the circulation desk promised to get the book
　　for me if only she could remember who last borrowed it.
　　2. Prof Lee’s book will show you how that you have observed can
　　be used in other contexts.
　　3. You can arrive in Beijing earlier for the meeting until you
　　don’t mind taking the night train.
　　4. Most electronic devices of this kind, that are manufactured
　　for such purposes, are packaged tightly.
　　5. Living in the central Australian desert has its problems, of
　　obtaining water is not the least.
　　6. Hydrogen is the fundamental element of the universe but that
　　it provides the building blocks from which other elements are produced.
　　7. That it is generally accepted, economic growth is determined
　　by the smooth development of production.
　　8. There are over 100 night schools in this city, making it possible
　　for a professional to be reeducated no matter how he does.
　　9. Doing your homework is a sure way to improve your test scores,
　　and this is especially true since it comes to classroom tests.
　　10. Granted that we had all the materials ready, we should begin
　　the new task at once.

　　【参考答案】
　　1. if only―only if
　　2. that后加what
　　3. until―provided
　　4. that―as
　　5. of―of which
　　6. but―in
　　7. That―As
　　8. how―what
　　9. since―when 10. had―have

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