问题
The girl began learning the piano _______ the age of four. She is very good _______ it now. [ ]
A: at, at
B: for, for
C: on,to
D:when, with
B: for, for
C: on,to
D:when, with
正确答案是：
同类题型
What were your parents doing when you phoned me last night?—They ________with my grandparents.
The strategies that Tom came up with worked out fine.
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Why did Miss Yang look so worried when we saw her? —Because she wondered __________.