Robert is away. He _______ America since last week.

A．has been to B．has joined a club in
C．has studied in D．has become a manager in

C

解析試題分析：句意：Robert走了。他從上個星期開始就在美國學(xué)習(xí)了。時間狀語是since last week，因此要選延續(xù)性動詞。Have beem to“表示去哪后并已回來了”；join和become都是點動詞，故選C。
考點：考查現(xiàn)在完成時的用法。

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