题目内容
Mary is always pleased _______ _______ at the party.
A. to invite; to sing B. to invite; singing
C. to be invited: to sing D. to be invited; singing
C
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题目内容
Mary is always pleased _______ _______ at the party.
A. to invite; to sing B. to invite; singing
C. to be invited: to sing D. to be invited; singing
C