1.Please let me know about it _A__

1.Please let me know about it _A__
A.when he comes
B.when he will come
C.whether he comes
为什么选A而不是B或C?
2.Could you please tell me which is the way to the maglev station?
为什么用which is the way to the maglev station而不是which the way to the maglev station is?
3.Do you know ______?
A.what's this
B.what's he
C.what's he doing
D.what's happened
选哪个?请说明理由
4.He told us he would come ______
A.next week
B.yesterday
C.the day before
D.the next day
选哪个?请说明理由
5.He said if it ____ fine,he_____to the park.
A.was,would go
B.would be,would go
C.is,will go
D.will be,will go
选哪个?请说明理由