At the end of one month, the boys (looked forward to) their mother’s (return) most earnestly, (as) they were really (tired with)

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问题 At the end of one month, the boys (looked forward to) their mother’s (return) most earnestly, (as) they were really (tired with) their father’s boiled eggs.

选项 A、looked forward to
B、return
C、as
D、tired with