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이것두........ 문제네
중국에사는초보자 | 2005.09.18 | 조회 314
Geometry is the branch of mathematics ________ the properties of lines, curves, shapes, and surfaces.



a. that concerned with

b. it is concerned with

c. concerned with

d. its concerns are



_________ for a career in dance generally begins at an early age.



a. People train

b. That people train

c. If training

d. Training



여기서 답은 d 인데 주어 역할을 하는 that 절 b는 안되나요?



An electromagnet is created _________ electrical current through a coil of wire.



a. by passing

b. passes by

c. to be passed

d. passed



여기서 a 인데 다른것은 왜안되는지.



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