问题
选择题
She read the letter through before sending it, ______ for spelling mistakes.
A．checked
B．to be checking
C．checking
D．having checked
答案
C
现在分词短语在此表示伴随。
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She read the letter through before sending it, ______ for spelling mistakes.
A．checked
B．to be checking
C．checking
D．having checked
C
现在分词短语在此表示伴随。