【題目】I ____ a tour guide for 7 months.

A. became B. was C. have been D. have become

【答案】C

【解析】句意：我當(dāng)導(dǎo)游已經(jīng)7個月了。一方面，有時間狀語for 7 months可知，是表達到目前為止的時間，用現(xiàn)在完成時態(tài)；另一方面become是非延續(xù)性動詞，不能和表示一段時間的狀語連用，故答案選C。

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