— Has Sam finished his homework today?
— I have no idea. He ________ it this morning.
| A．did | B．was doing | C．has done | D．had done |
. ________ we’ll go camping tomorrow depends on the weather.
| A．If | B．Whether | C．That | D．Where |
. ________ his failure lies is expected ________ clear to us.
| A．What… to make | B．How… made |
| C．Where… to be made | D．Why… Making |
. It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．that what | C．what | D．how |
主从复合句
名词性从句：主语、表语、宾语与同位语从句及其连接代词、连词与副词
. It didn’t surprise us at all ________ he was post to Hong Kong.
| A．why | B．how | C．what | D．that |
. – Do you have a mobile phone?
– Yes, ________.
| A．I have it | B．I have | C．I have one | D．I do one |