It _______ we had stayed together for a couple of weeks _______ I found we had a lot in common.[ ]

A. was until; when

B. was until; that

C. wasn’t until; when    

D. wasn’t until; that

筛管输导的物质和输送的方向是（    ）

A．有机物从上向下

B．有机物从下向上

C．无机盐和水从上向下

D．无机盐和水从下向上