问题
选择题
______ very important and convenient for us ______ a mobile phone now.[ ]
A. That's, have
B. It's, have
C. That's, had
D. It's, to have
答案
答案：D
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______ very important and convenient for us ______ a mobile phone now.[ ]
A. That's, have
B. It's, have
C. That's, had
D. It's, to have
答案：D