27、It's natural that a house made of wood or bamboo may stay up in an earthquake while it's easier for __________ made of steel and concrete to fall down sometimes.

A.one                 B.that                 C.it                     D.what

27、A

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It's natural that a house made of wood or bamboo may stay up in an earthquake while it's easier for __________ made of steel and concrete to fall down sometimes.

A.one                 B.that                 C.it                     D.what

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