专四专八考试

【单选题】 At that moment when he was told that the radio station had found his son for him, it was all he could do ______.
A．cry
B．crying
C．to cry
D．cried

网考网参考答案：C
网考网解析：
固定结构题。it’s all sb can/could do to do sth．这一结构，表示“只能……”的意思，经常用于口语中。故[C]正确。 查看试题解析出处>>