问题

Daniel is busy these days. I doubt he will come to my birthday party or not this Sunday.

A:that
B:when
C:how
D:whether;

正确答案是：

同类题型

There __________ a meeting tomorrow afternoon.

We’re so busy that no one in the office can_____ for any other work.

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These two maths problems can’t be used in the exam.They are too_________to the students.Everyone can remember the answers.