I had intended to call on you yesterday, but someone __________ to see me.
A. did came
B. do come
C. come
D. came
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He said he _______________ a report since two o'clock that morning.
A. write
B. wrote
C. had been writing
D. will write
I _______________ my favorite TV show at seven o'clock this evening.
A. will be watching
B. watch
C. watches
D. had watched
如何计算N个电池串联构成的模组电量和N个电池并联构成的模组电量。