问题

So difficult __________it to live in an English-speaking country that I determined to learn English.

A:I have felt
B:have I felt
C:I did feel
D:did I feel

正确答案是：

同类题型

Three people got killed by two explosions.—When was __________?—________ was on April 15 __________ the 2013 Boston Marathon was being held．

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