The basic physical unit of heredity is a gene
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I met she after she had divorced.
Lan said she had been chosen as a beauty queen 4 years before.
An idea occurred to him that she herself had helped him very much in the everyday life.
We had had lunch when she arrived.
No sooner had he returned from a long journey than he was ordered to pack his bags.
When I arrived John had gone away.
Yesterday, I went out after I had finished my homework.
I had prepared for the exams and was ready to do well.
Tom had lost twenty pounds and could begin anew
If I had known that, I would have acted differently.
She would have come to the party if she had been invited.
I had lived abroad for twenty years when I received the transfer.
Jane had studied in England before she did her master’s at Harvard.
