搜题请搜索小程序“爱下问搜题”
问题 选择题
You speak too          /fa：st/．I can't follow you．
A．faceB．fastC．flagD．first.
答案

答案：B

选择题

-What's up? You look worried.

Well,I_____on the problem for 5 hours but I haven't got a single clue.

A．have worked

B．worked

C．will work

D．have been working
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填空题
4
15
的分子加上12，要使分数大小不变，分母应加上______．
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