问题
选择题
She kept _________ hard at her physics and finally caught up with us.
A．work
B．worked
C．working
D．to work
答案
答案：C
题目分析：句意：她在物理上继续努力，最终赶上我们。keep doing一直做某事，根据题意，故选C。
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She kept _________ hard at her physics and finally caught up with us.
A．work
B．worked
C．working
D．to work
答案：C
题目分析：句意：她在物理上继续努力，最终赶上我们。keep doing一直做某事，根据题意，故选C。
