0201--9`30.

lf

9, Insulin is manufactured by specialized cells in the pancreas and
released------ glucose reaches a certain concentration in the
bloodstream.



A, which    B, whenever      C,how     D, during



为什么答案选B？



30, Harbors are (protected) areas (of water) that can be (used the) transfer of passengers and cargo (between) ships and shore.



C错， 改成used by the？ are protected 后可接宾语？



先谢了！！！！！！！！

linlin315

9, Insulin is manufactured by specialized cells in the pancreas and
released------ glucose reaches a certain concentration in the
bloodstream.



A, which    B, whenever      C,how     D, during

--------后面是个完整的句子，所以可以排除a&d

这句话的意思是Insulin将被释放，当glucose在血液中达到一定的浓度的时候，所以选B

xkfy0521

9, Insulin is manufactured by specialized cells in the pancreas and
released------ glucose reaches a certain concentration in the
bloodstream.
A, which    B, whenever      C,how     D, during

横线后面是个完整的句子，所以找个连词，而during后面不能加句子。

30, Harbors are (protected) areas (of water) that can be (used the) transfer of passengers and cargo (between) ships and shore.

C错， 改成used by the？ are protected 后可接宾语？

protected做定语，C改成be used for

linlin315

30, Harbors are (protected) areas (of water) that can be (used the) transfer of passengers and cargo (between) ships and shore.



C错， 改成used by the？ are protected 后可接宾语？
这里不是are protected被动形势，实际的结构是harbors are areas，什么样的areas呢，protected areas.

be used for sth

lf

protected 就是“同源过去分词”？ 起形容词作用？

谢谢俩位的及时详细解答。非常感谢！！！