觉得答案错了，大家看一下

iceoolong

Massachusetts was first explored in the late sixteenth and early seventeenth centuries, and the first permanent settlement at Plymouth in 1620.

centuries是不是应该改成单数？答案上怎么是settlement at错了，

Gelidjelly

提示：
and 连接两个句子
and 后缺少谓语

the late sixteenth (century) and early seventeenth (century)
==>the late sixteenth and early seventeenth centuries

Gelidjelly

参考答案：
... and the first permanent settlement was at Plymouth in 1620.
or
... and the first permanent settlement was Plymouth in 1620.

iceoolong

原来如此，果然是高见，我还以为后面那个也是表语呢！另外，century原来是这么用的，多谢指教