单项选择题

All the kids are crying now. What （） makes them so unhappy.

A. it is
B. is it
C. it is that
D. is it that

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单项选择题
Diana felt very much upset at （） to the party as she had longed to go for a long time.

A. having not been invited
B. not having been invited
C. not to be invited
D. to be not invited
单项选择题
He will come to call on you the moment he （） his work.

A. will finish
B. finishes
C. finished
D. to finish
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