—How long have you been like this?
—      .
A．Last month           B．Two months ago       C．Since last month
C
考察時間狀語。Last month上個月；Two months ago兩個月前；Since last month自從上個月以來。根據(jù)上文，你這樣多久了？since last month與現(xiàn)在完成時連用，AB與一般過去時連用，故選C
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