We had to be patient because it______some time_____

单选题We had to be patient because it______some time______we got the full results.

A．has been; since
B．had been; until
C．was; after
D．would be; before

【答案】D。解析：本题考查“it+be+一段时间+before／after／since+从句”句型。在这一句型中，before从句中的动作经过一段时间后才会实现；after从句中的动作发生后已经过去了一段时间；since从句中的动作完成后到现在已经有一段时间了。根据题意可知，D项正确。

1 The young______eaten up almost everything; one and a half bananasleft
on the table.

A．have; has been
B．are; is
C．has; have been
D．is; are

2Once our chickens started laying eggs, we had such a______of eggs that we were giving many away to our neighbors.

A．plenty
B．surplus
C．output
D．production

3Your help is______for the success of the project.

A．inevitable
B．indicative
C．indispensable
D．inherent