问题

The research lack _____sevidence, and therefore, its conclusions are doubtful. [ ]

A: solid
B: fierce
C: severe
D: potential

正确答案是：

同类题型

What are doing over there?– I am eating my meal. Would you come______?

Would you like some milk –________.

MrBorisThis is Grand CartelYou’ve left your luggage here.—Goodness me! So I I’ll go back and get it right away

I’m looking forward ________ a trip to Mount Tai. [ ]

this is nothing but common vegetable soup!—________，madam. It’s our soup of the day.