题目内容

一个单倍体酵母细胞是a型还是α型是由其本身的遗传特性所决定的,是稳定的遗传特征,不会发生转变。

A. 对
B. 错

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我已经考虑过这件事了I ________________ it over.A.B. C.

A. have thought
B. had thought
C. have been thinking
D. have been thought

我教英语已经教了六年了。I ______________English for 6 years.(是否延续下去,看上下文)

A. have been taught
B. have been teaching
C. has taught
D. have taught

我一直在考虑这件事.I _______________ it over.A. . C.

A. have been thinking
B. have think
C. have thought
D. have been thought

我教英语已经教了六年了。I ______________ English for 6 years(我还会继续教下去)A. B. C.

A. have been teaching
B. has taught
C. have taught
D. have been taught

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