英语语法达人请进，左边是正确答案，横线上的是我错选的答案，请给出具体原因，以题号为准

Question

C1. By the time you arrive in London, we ___D_____ in Europe for two weeks.
[A] shall stay 指还没发生的事情
[B] have stayed
[C] will have stayed
[D] have been staying
C6. Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it _____B___ in a religious, as well as worldly, frame of reference.
[A] is to be analyzed
[B] has been analyzed
[C] be analyzed
[D] should have been analyzed
B7. The millions of calculations involved, had they been done by hand, ____D____ all practical value by the time they were finished.
[A] could lose
[B] would have lost
[C] might lose
[D] ought to have lost
B8. No bread eaten by man is so sweet as ______A__ earned by his own labour.
[A] one
[B] that
[C] such
[D] what
B10. Scientists generally agree that the Earth’s climate will warm up over the next 50 to 100 years _____C___ it has warmed in the 20,000 years since the Ice Age.
[A] as long as
[B] as much as
[C] as soon as
[D] as well as

Answer 1

C1. By the time you arrive in London, we ___D_____ in Europe for two weeks.
[A] shall stay 指还没发生的事情
[B] have stayed
[C] will have stayed
[D] have been staying
你到伦敦的时候我们已经在欧洲住了两个星期了。首先，你还没到伦敦呢，所以用will, 那会已经住了两星期，所以用现在完成时。
B8. No bread eaten by man is so sweet as ______A__ earned by his own labour.
[A] one
[B] that
需要一个指代词，A应该是 the one。
B10. Scientists generally agree that the Earth’s climate will warm up over the next 50 to 100 years _____C___ it has warmed in the 20,000 years since the Ice Age.
[A] as long as
[B] as much as
[C] as soon as
[D] as well as
这里是说温度上升的度数，所以用much数量词。
其他的题目我也不会呵呵~