问题: 请教几个托福语法题目
The seventeenth century discovery___forms of life that are invisible to the naked eye was a dramatic one in human history.
A of
B that
为什么of 对that 就不对？
2改错Electricity is the phenomenon (associated)A with positivily and (particles charged)B of the matter (at rest)C and in motion ,other (individually)D or in great number.
3The body of (sea anemone )A is (basically)B a hollow sac (with)C a month at (one end)D.
解答:
1. of forms of life这个介词短语作discovery的定语，而如果用that, 后面必须是个从句，显然不对。看清楚句子结构，后面的that从具又是life 的定语。
既然不是个完整的句子，当然要选择of了。
2 B. 改为 charged particles. Positivily应该为positivity
3。A改为 a sea anemone
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