问题
选择题
--- I rang you at about ten, but there was no reply.
--- Oh, that was probably _____ I was seeing the doctor.
A．for
B．why
C．when
D．how
答案
答案：C
考查连词。根据上下文可的句意知C正确。句意—我在10点打你电话，但是没有回音。—那也许就是在我去看医生的时候吧。
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