Question

英语语法问题！求各项的详细解释！谢谢！

More and more people hold the idea that（ ） letters by e-mail is far more convinent than by post
A.sending B.sent C.send
还有一题
ask him how much （ ）
A.did the suit cost B.cost the suit C.the suit cost D.the suit was cost

Answer 1

供参考

A - sending letters by e-mail (动名词作主语)

*********

C - how much the suit cost.

这里不是疑问句
所有不用 did (A不是答案)
不需被动语法 (D不是答案)
cost the suit 次序不对( B不是答案)

因此答案是 C
原句後半部用的是’过去时‘
所以cost 不用加 s
cost 的过去式也是 cost

Answer 2

1.A
2.a

Answer 3

A send是从句的主语
A 用how much 提问价格 物作主语，