“There were already five people in the car but they managed to take me as well.”“It________ a c“There were already five people in the car but they managed totake me as well.”“It________ a comfortable journey.”A.can't beB.shouldn't b

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“There were already five people in the car but they managed to take me as well.”“It________ a c
“There were already five people in the car but they managed to
take me as well.”“It________ a comfortable journey.”
A.can't be
B.shouldn't be
C.mustn't have been
D.couldn't have been
【精析与答案】 D.从上句得知“已有5 个人在车上”,故“一
路上不可能舒适”(含“车内很拥挤”之意).
为什么呀AC

mustn't 不用来表示推测.要用can't 或couldn't.后接动词原形(常为be)推测现在和未来.后接have done 推测过去发生过的事.