选出下面单词画线部分发音不同的一项。（4%）
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My birds can ___by one of my friends while I'm away.
A. be looking after
B. look after
C. be looked after.
Jack__China__two years.
A.has been in, for
B. has been in, since
C. has come to, for
John knowsa computer.
A. how to use B. how use C. how uses
I don't know when he . When he , I'll let you know.
A. comes, comes B. will come, comes C. comes , will come
Jim always comes to schoolof all.
| A．early | B．earlier |
| C．most early | D．earliest |