问题

The production of television commercials must be professional ________ they aim at promoting good service, or public education

A:when
B:no matter
C:if
D:whether

正确答案是：

同类题型

According to my grandma, it is a goodidea to eat chicken soup when you have a cold.— ________, scientists agree with her.

Having questioned the spy for two days, the officer didn’t ______ any valuable information. [ ]

Let’s go for a picnic when it ______ this weekend.— But nobody knows when it _____ . I hate the rainy days.

, SallyHow’s everything going— _______

Look! That woman looks like your mother.—It ________her. My mother___________Japan_____business.