中心性发绀可见于
A．肺淤血
B．Fallot四联症
C．原发性肺动脉高压
D．Eisenmenger综合征
E．阻塞性肺气肿
参考答案：A,B,C,D,E
When Harry was at college, he ________ go to the reading room after supper every day.
A．should
B．might
C．would
D．could
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