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IV. 词汇与语法:（共15小题；每小题1分，满分15分)48. Justin ________ really shy and quiet. Now he's very outgoing.

A. use to be
B. used to be
C. use to
D. used to

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A. Oh, no. Let's not
B. I'd rather stay at home
C. I'd love to, but I have other plans
D. Oh, no. That’ll be too much trouble

A. a few
B. few
C. little
D. a little

A. work on
B. take on
C. keep on
D. depend on

A. How long
B. How far
C. How soon
D. How often