800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 2

An amoeba can move (5) _______ changing the shape of its body. It sticks out a pseudo pod, or false foot. A paramecium is covered with tiny hairs. It waves its hairs rapidly to swim.

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An amoeba can move (5) _______ changing the shape of its body. It sticks out a pseudo pod, or false foot. A paramecium is covered with tiny hairs. It waves its hairs rapidly to swim.

by

after

before

during

Giải thích

A là đáp án đúng