This is partly why,though people talk a lot ,the number of companies whis work-at-home programs____ small.
问题描述：
This is partly why,though people talk a lot ,the number of companies whis work-at-home programs____ small.
A.remain B.remaining C.remains D.hasremained
The day must be breaking,_____the birds have begun singAging.
A.becase B.as C.for D.since
我需要详细的分析
答
1 选C ,考点在the number of,后面的动词用单数.
2 选C ,考点在 这四个连词的区分,for只表示补充说明的原因,也可表示从表面现象推测出来的原因,主从句位置通常可以调换也成立,只能用在句中,前面要有逗号与主句分开.
关于这四个词的区分,可看参考资料