This broadcast comes to us ______ from the stadium.

A.comes

B.came

C.will come

D.has come

examination system comes into existence.

(A) arise (C) raise

(B) rise (D) arouse

when the examination system comes into existence.

(A) arise (C) raise

(B) rise (D) arouse

test scores, and this is especially true ____________ it comes to classroom tests.

A) when B) since

C) before D) after

Joe is not good at sports, but when it mathematics, he is the best in the class.

A) comes up to B) comes around to C) comes to D) comes on to

We are looking forward to （).

A.his coming

B.he's coming

C.he coming

D.he comes

to improve your test scores, and this is especially true ____________ it comes to classroom tests.

A) when B) since

C) before D) after

A.“To Autumn”

B.“To a Nightingale”

C.“Ode to the West Wind”

D.“To a Skylark”

According to the CDD's Chester, nobody can take Microsoft seriously when __

[A] it talks about competitive behavior

[B] it comes into a room

[C] it doesn't threat to privacy

[D] it doesn't have any opponents

【题目描述】

30. —She asked you when _________ again？

—Tell her that I'll let her know when he _________.

[ A] he came; comes

[ B ] would he come ; will come

[ C] he came; will come

[ D] he would come ; comes

【我提交的答案】：C

【参考答案与解析】： 正确答案：D

答案分析：

30．D【解析】本题考查时态的用法。根据句意；可知正确答案是D。

【我的疑问】（如下，请求专家帮助解答）

运用什么时态

What is the underlying reason that maximum profit comes at the level of output where marginal cost equals price（)。

A、there is additional profit as long as the price is greater than the marginal cost of the last unit

B、there is additional profit when the marginal cost of a unit is higher than the price

C、there is no more profit when the price is greater than the marginal cost of the last unit

D、price is not important in determining profit

E、none of the above