问题
选择题
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
答案
答案：C
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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
答案：C