seeds take up to eighteen months to mature before they germination发芽, and the youth may need another two years to reach at the flowering.

选D，问题是a 为什么对？我们不是一直说 Sb. takes some time to do something吗？哪来的up to 呢？还有D，应该改什么才对？

2.not only as a cooked dish the world over, but it is also used as the foundation of many other food.

A eating rice

b rice is eaten

C people eat rice

d is rice eaten

答案 C，d错在哪里？这里不是应该倒装吗？

3. one after another, parallel computers perform groups of actions at the same time.

A conventional computers, by handling tasks

B since tasks being handled by conventional computers

C whereas conventional computers handle tasks

D while tasks handled by conventional computers

答案D，可是D中的tasks handled 是否应用被动态？再看C，是不是更好？

4. The chief purpose of management if for making every behavior or decision help achieve a carefully chosen goal.

我知道答案是A，可不知道改什么好？

请大虾帮助我解答！

1，they->their, reach at->reach,up to /adv

2,这个句子有问题

3,C

4，-》is to make

你每个句子都抄错！！！