______ very important and convenient for
问题:
______ 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
______ 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