求帮助！！！！英语选择题！！ The Browns have arrived, but I didn't know they____

Question

The Browns have arrived, but I didn't know they____until yesterday. A had come B were coming C came D will come 帮忙分析下。 The poet and writer_____not agree to public his book. \ A do B does 这道为什么选B？ The plane_______by the time you get to the airport in your car. A had landed B will have landed 问：by de time 在这道题里面与该选项有关系哇？ 求解析~~~

Answer 1

The
Browns
have
arrived,
but
I
didn't
know
they____until
yesterday.
A
had
come
B
were
coming
C
came
D
will
come
帮忙分析下。
答：B
译：布朗夫妇（一家人）已经到了。不过我直到昨天才知道他们要来。
析：第一句话说明了一个事实，布朗一家人已经到了。其实这句话也是一个干扰项，目的是让你填A。而后一句中的yesterday是引诱同学选C的。选D的同学会很少！
其实but
后面的这个并列分句=I
didn't
know
sth.
untill
yesterday.
我直到昨天才知道一件事。
什么事情呢？就是他们要来的这件事情。我们知道，表示“来”、“去”的位移动词，可以用进行时态表示将来，如：They
are
coming.
他们要来了。而这里的they
were
coming.
就相当于they
would
come.
是指过去的将来。D项如改为would
come,
就有两个答案了。
23题也为B，没有什么难度，不答了。