2. 外语
  3. Today we take for granted that the mail will be delivered daily at our door. But many years ago it might have been placed in a

Today we take for granted that the mail will be delivered daily at our door. But many years ago it might have been placed in a

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问题     Today we take for granted that the mail will
be delivered daily at our door. But many years ago
it might have been placed in a tree trunk and          【M1】 ______
underneath a rock. In the early days of the mail no
one could be sure about where or when it will arrive   【M2】 ______
    At the southern tip of Africa there was once a
post office under a rock. At the old days the route    【M3】 ______
from England to India was around the Cape of
Good Hope. The journey was stormy and danger.
It took six long months. Sailors often wished to       【M4】 ______
send mail home, but they seldom met ships bound
back to England. So at the cape the sailors would
go on ashore. They headed for a certain large          【M5】 ______
stone. On the stone scratched the words "Look          【M6】 ______
hereunder for letters." They would leave their letters
there, knowing that the next homeward ship             【M7】 ______
would stop and pick it up.
    There was another post office like this at the
southern tip of South America. During the golden       【M8】 ______
rush days, boats sailed around Cape Horn to
California. At Cape Horn was a key(小桶)nailed to a
post. Boats coming from the east coast would send  
for some sailors to this post office. They picked up   【M9】 ______
any letters in the key. At the same time they
mailed letters home that boats sail east could pick    【M10】 ______
up.

【M10】
选项
答案sail改成sailing
解析 此处考查非谓语动词的用法。根据boats sail east could pick up中could为谓语动词， sail应变为现在分词作定语，修饰boats。
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大学英语四级

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