SpacecraftDiscoveryhasfailedin

---Spacecraft “Discovery” has failed in the course of launch.
　　----_______? They have been preparing for the test.

A．How come

B．When

C．How

D．Why not

登录免费查看答案和解析

相关试题

The fireman succeeded in saving all the people in the house on fire, _______they knew they were in great danger themselves.

A．because

B．since

C．unless

D．though

收藏答案/解析

My brother ______French while he was working in Paris, and he could speak it very well.

A．took up

B．put up

C．picked up

D．gave up

收藏答案/解析

It is normal for students to feel_______ before the examination even though they have prepared well.

A．serious

B．anxious

C．energetic

D．surprised

收藏答案/解析

The little girl seems to ____a lot since I last saw her.

A．have been changed

B．have changed

C．change

D．be changing

收藏答案/解析

Most experts agree that washing hands regularly is a ______way to prevent the spread of many diseases.

A．powerful

B．illegal

C．painful

D．awful

收藏答案/解析

推荐套卷

热门套卷