主语从句练习
1. _____ as much as one-fifth of all timber harvested is not used.
A. The estimate B. The estimated C. They are estimated D. It is estimated that
2. _____ some mammals came to live in the sea is not known.
A. Which B. Since C. Although D. How
3. _____ we have achieved is attributed to the guidance of our parents.
A. Whoever B. Whatever C. However D. That
4. _____ wealthy does not necessarily mean that a man is greedy.
A. For the reason that he is B. Just because he is
C. The reason of being D. That he is
5. Although ___ happened in this developed country sounds like science fiction, it could occur
elsewhere in the world.
A. which B. what C. how D. it
6. _____ she had forgotten to take her notebook.
A. That occurred to her B. She occurred that C. To he
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