---Why do you look so worried?
---I’m expecting a call from my son. He              London for three days.
A．has been toB．has been in
C．has gone to D．has come in
B

試題分析：句意：你為什么看起來這么焦慮？我在期盼著兒子打來的電話。他去倫敦三天了。句中有表示一段時間的短語for three days，所以謂語動詞必須是延續(xù)性動詞，故選B。
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