99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<dl id="4nrup"><acronym id="4nrup"></acronym></dl>

<pre id="4nrup"><strong id="4nrup"></strong></pre>

單項(xiàng)選擇題

You must explain（）how they succeeded（）the experiment.

A.of us；for
B.at us；at
C.to us；in
D.for us；to

你可能感興趣的試題

單項(xiàng)選擇題

We（）every day when we were children.

A.used to swim
B.used to swimming
C.use to swim
D.use to swimming

單項(xiàng)選擇題

We must make a difference between（）language and（）language.

A.spoken；written
B.speaking；written
C.speaking；writing
D.speak；write