室内压最低是在（）
A．等容收缩期
B．等容舒张期
C．快速充盈期
D．减慢射血期
E．快速射血期
参考答案：C
-----What were you up to when she dropped in?
------I______ for a while and _____ some reading.
A．had played ; did
B．played; did
C．had played :was going to do
D．was playing; was going to do
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