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2 초급 [부정사] 빈칸에 정답을 고르시오   토플
(토플) Heating and cooling can cause matter (_______).
1) expanding and contracting
2) expansion and contract
3) to expand and contract 
4) expand and contract
1 초급 [부정사] 빈칸에 정답을 고르시오   수능

(수능) Baseball is said to (_____) invented in 1839.

1) be

2) was

3) have been

4) had been
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