Robert is away. He _______ America since last week.
A．has been toB．has joined a club in
C．has studied inD．has become a manager in
C

試題分析：句意：Robert走了。他從上個(gè)星期開始就在美國學(xué)習(xí)了。時(shí)間狀語是since last week，因此要選延續(xù)性動(dòng)詞。Have beem to“表示去哪后并已回來了”；join和become都是點(diǎn)動(dòng)詞，故選C。
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