问题

Not until recently _______the development of tourist-related activities in the rural areas.

A:they had encouraged
B:had they encouraged
C:did they encourage
D:they encouraged;

正确答案是：

同类题型

______ do the animals in Beijing Zoo come from—They come from many different countries.

Experiments of this kind ___in both the U．S and Europe well before the Second World War

下列各句中，加点的成语使用最恰当的一句是（）

The word “nut” has “n” and “u” in it .