被称为“非洲屋脊”的是（）
A.东非高原
B.巴西高原
C.埃塞俄比亚高原
D.刚果盆地
参考答案：C
You ________ in person; a telephone would have been enough.
A．couldn't have come
B．needn't have come
C．shouldn't have come
D．mustn't have come
HDMI接口松动，有可能造成（）．
