I’m looking after Tom today. He’s been in my house______8:00 this morning.
A．a(chǎn)tB．forC．sinceD．till
C

試題分析：在表示時(shí)間時(shí)，at表示在幾點(diǎn)鐘；for后接一段時(shí)間，表示動(dòng)作持續(xù)長(zhǎng)短；since接時(shí)間點(diǎn)，表示自從……以來(lái)；till接時(shí)間點(diǎn)，表示直到……。句意：今天我正在照顧湯姆。自從今天上午八點(diǎn)以來(lái)他就在我家。結(jié)合語(yǔ)境可知選C。
點(diǎn)評(píng)：英語(yǔ)介詞的一個(gè)特點(diǎn)是一詞多義，并且介詞間語(yǔ)義交叉現(xiàn)象很多，習(xí)慣用法也很多，有時(shí)很難從詞義上區(qū)分開(kāi)來(lái)。故學(xué)習(xí)中要注意不斷總結(jié)，熟記一些介詞和動(dòng)詞的固定搭配用法及習(xí)慣用法，是完成此類問(wèn)題的捷徑。
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