计算开行某对旅客列车所需的运用车底数需要掌握（）等数据A.平均每天开行该旅行旅客列车数B.车

It was 12 o'clock ______the plane took off.

A．when

B．that

C．since

D．till

It was 12 o'clock ______ the plane took off.

A．when

B．that

C．since

D．till

It was 12 o'clock ______ the plane took off.

A．when

B．that

C．since

D．till

A．It

B．That

C．What

D．Which

According to the schedule, the plane for Sydney ______ at eight o'clock in the evening.

A．takes off

B．is taking off

C．has taken off

D．was taking off

When did the plane have a trouble？

A．During her visit in Cairo.

B．After she finished her visit.

C．When it was preparing to take off.

D．After it took off.

When did the plane have a trouble？

A．During her visit in Cairo.

B．After she finished her visit.

C．When it was preparing to take off.

D．After it took off.

听力原文：M: The plane was supposed to arrive in Shenzhen at ten o'clock.

W: Ten o'clock! But it's already ten-thirty!

What does the woman mean？

A．They're going to be very late.

B．The plane doesn't fly near Shenzhen.

C．The plane is going to land.

--You've booked on a two o'clock flight.--What chance ______ of taking a later plane？

A．there is

B．it is

C．is there

D．is it