心包摩擦音通常在什么部位听诊最清楚

A．心尖部

B．心底部

C．胸骨左缘第三、四肋间

D．胸骨右缘第三、四肋间

E．左侧腋前线三、四肋间

. If it _____ sunny, we _______ a picnic. But it is raining now.

A．had been, could have had

B．were, could have

C．had been, had

D．is, could have