问题

I ______ to reach the manager for the last two hours but the line is always busy．

A:tried
B:have tried
C:had tried
D:have been trying

正确答案是：

同类题型

Our teacher did what she could ______uswith English

The population of Shanghai is ______ than that of Sichuan.—-Yes, the number of the population of Shanghai ______ 23 million.

下列各句中，没有语病的一句是

The weather turned out to be fine I thetrouble to carry the umbrella with me

John is very lazy. He falls ______ behind among thestudents.