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="9lst5"></dl>

<ins id="9lst5"><tt id="9lst5"><code id="9lst5"></code></tt></ins>

單項選擇題

James Watt（）the steam engine.

A.was inventing
B.invented
C.had invented
D.has invented

你可能感興趣的試題

單項選擇題

It is（）to interrupt the others while they are talking.

A.rough
B.rude
C.polite
D.troublesome

單項選擇題

It was well known that Thomas Edison（）the electric lamp.

A.invented
B.discovered
C.found
D.developed

<dd id="ndirh"></dd>

<blockquote id="ndirh"></blockquote>

<pre id="ndirh"></pre>