I'm used to ________ him emails instead

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问题选择题

I'm used to ________ him emails instead of ________ him letters. [ ]

A. send; write

B. send; writing

C. sending; writing

D. sending; were

答案

答案：C

选择题

Many teens don't get enough sleep because they have too much homework to do, which ________ them up at night.

A．makes

B．breaks

C．turns

D．keeps

填空题

人类MHC分子首先在人外周血______表面发现，故称HLA。