单选题
I was very sleepy. I tried ______ my eyes open but I couldn"t.
A、
keeping
B、
having kept
C、
to have kept
D、
to keep
【正确答案】
D
【答案解析】
不定式
句意：我困得厉害，怎么努力也睁不开眼。
try to do sth．表示努力、设法做某事。
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