问题

The old couple looked at the plane with their son on it until it was ______.

A:at the first sight
B:out of sight
C:in sight
D:at the sight of;

正确答案是：

同类题型

“May I speak to your manager Mr. Williams at five o’clocktonight”— “I’m sorry. Mr Williams ________ to a conference by then.”

Don’t worry. Your brother is coming to help you.—________ he doesn’t come

is often the case in science, there is nosimple answer

I don’t like white,but my brother_______.

I don’t think Mary and Sue _____ before, ______?