单项选择题

Selecting a mobile phone for personal use is not an easy task because technology ______ so rapidly.

A.is changing
B.has changed
C.will have changed
D.will change
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单项选择题
— He failed to reach the top of the mountain. — That’s right. Perhaps he might as well ______ it on such a bad day.
A.not climb
B.never have climbed
C.have climbed
D.hadn’t climbed
单项选择题
Fever ______ sickness
A.tells
B.indicates
C.indicate
D.tell
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