It is predicted that in 100 years' time _______

【問題】
It is predicted that in 100 years' time ___________ will be 100 times more computers than now, each 100 times more powerful than those in use today.

【選択肢】
1.　there
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2.　they
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3.　those
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4.　it
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問題提供：リアル・イングリッシュ・ブロードバンド株式会社
http://jibun.atmarkit.co.jp/misc/ct.php?id=TR56_RE1
No.09320060608