I am looking after little Tom today. He’s been in my house _________ 8:00 this morning.
A．a(chǎn)tB．sinceC．forD．till
B

試題分析：句意：今天我一直在照顧小湯姆，從今天上午八點(diǎn)他就一直在我家�，F(xiàn)在完成時(shí)可以用來(lái)表示發(fā)生在過(guò)去某一時(shí)刻的,持續(xù)到現(xiàn)在的動(dòng)作（用行為動(dòng)詞表示）或狀態(tài)（be動(dòng)詞表示）常與for（+時(shí)間段）,since（+時(shí)間點(diǎn)或過(guò)去時(shí)的句子）連用。根據(jù)該句的時(shí)間是時(shí)間點(diǎn)，故選B。
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