13、How long do you think        Obama officially takes office in the White House?

A. it will be that       B. will it be until      C. will it be when      D. it will be before

13、D

解析：考查句式結(jié)構(gòu)和語(yǔ)序。注意本句不是強(qiáng)調(diào)句，而是it做主語(yǔ)表示時(shí)間，before引導(dǎo)時(shí)間狀語(yǔ)從句的it be+一段時(shí)間+before引導(dǎo)的狀語(yǔ)從句，表示“在……之前有多久，多長(zhǎng)時(shí)間之后……”。句意：你知道奧巴馬還要等多長(zhǎng)時(shí)間才正式在白宮上任嗎？

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