问题

Malaysia Airlines Flight 370 ___________ course and turned back toward Kuala Lumpur — but there were no indications from the pilot that he was doing so.

A:must have changed
B:could have changed
C:might have changed
D:should have changed

正确答案是：

同类题型

It’s the _______ that caused the big forestfire. A young man dropped it carelessly at picnic.

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What’s wrong with Simon He isn’t at school today.—His legs hurt. He was by a motorcycle this morning.

下列各句中，没有语病的一句是