国家开放大学 / 综合英语(3)
正确率:100%
The light from a laser, _ _ _ _ _ _ in only one direction and _ _ _ _ _ _ _ _ in a narrow beam, is much stronger.
A.moves; concentrates
B.moving; concentrating
C. moving; concentrated
D.moved; concentrates
A.moves; concentrates
B.moving; concentrating
C. moving; concentrated
D.moved; concentrates
参考答案:
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