问题

Storms most commonly occur_______a warm airmass and a cold air mass touch each other

A:word
B:words
C:expression
D:expressing

正确答案是：

同类题型

Would you mind if I used your mobile phone?– _______, please.

Miss Smith is very kind. We all like_________ .

_______ was _______ who I met in the museum this morning.[ ]

I had hoped to take a holiday this year but I wasn’table to ______

下列各项对课文内容的理解不正确的是