Choose the correct clause which clearly completes the sentence. 1. The servant came back after * he posted the letter. he had posted the letter. he has posted the letter.
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Cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. It is mainly composed of water, salts, and proteins. ... All of the organelles in eukaryotic cells, such as the nucleus, endoplasmic reticulum, and mitochondria, are located in the cytoplasm.
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