27.i saw ann inthe library yesterday.You ____ her,she is still abroad.A)could not seeB)cann’t have seenC)must not haveseenD)had not seen请问为什么选择B呢,
问题描述：
27.i saw ann inthe library yesterday.You ____ her,she is still abroad.
A)could not see
B)cann’t have seen
C)must not haveseen
D)had not seen
请问为什么选择B呢,
答
否定句中的猜测用 can't （你不可能看见她,她还在国外）
加油!不明白再问!