-I'm so sorry that you didn't win the sk

题型:选择题

问题:

-I'm so sorry that you didn't win the skating marathon.

-How long _____ you ______?

-I skated for 5 hours.

A.have, been skating

B.were, skating

C.have you skated

D.did, skate

考点:过去进行时一般现在时过去完成进行时
题型:选择题

烹饪既是一门严肃的科学,又是一门精妙的艺术。

题型:选择题

锯条安装在锯弓上的方向是锯齿的前倾方向应向着拉力方向。

题型:选择题

Fire hose should be washed with().

A.salt water and a wire brush

B.caustic soap

C.mild soap and fresh water

D.a holystone

题型:选择题

邮政客户服务中心的接入呼号是()。

A.185

B.183

C.160

D.163

题型:选择题

下列属于旋转式泵的是()。

A.柱塞泵

B.齿轮泵

C.往复泵

D.离心泵

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