After describing the planned improvements, she went on _____ how much they would cost. 
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A
to explain
B
explaining
C
to be explaining
D
having explained
推荐题目
To be admitted to a key university, _______.
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A
our parents always impress on us the importance of hard work
B
some universities attach great importance to students’ grades
C
all the students in senior 3 are making every effort to study hard
D
good grades are quite necessary