-You look upset.
-Yes, this is the first time I________ form home.
A．leaveB．leftC．have been awayD．is away
C

試題分析：考查固定句型：this is the first time+從句…，從句中用現(xiàn)在完成時，句意：這是我第一次離開家。選C.
點(diǎn)評：這個句型要是變成this was the first time+從句…從句中用過去完成時。
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