问题

the big crowd coming towards him, he started to run down the hill, but ______ and went down on his hands and knees in the melting snow.

A:slipped
B:skied
C:signalled
D:sank;

正确答案是：

同类题型

____ computers are of great benefit to the development of science and technology.

The machine is so old ___ it can’t be used any more ___ some of its parts are changed.

__________there are only 20 minutes left before the train left，I felt uneasy in the taxi to the railway station.

The teacher asked those boys ______ so much noise.

下列各句中，表达得体的一句是