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