Question

请教几道英语选择题,说明理由

1. "We didn't see him at the lecture yesterday." "He____it." A. mustn't attend. B. cannot have attended C. would have not attended D. needn't have attended 2. Man ____die without air or water. A. will B. shall C. should D. would 3. Oh dear! What on earth ____ this mean? A. should B. can C. may D. might 4. At the moment she ____ with her brother at home. A. may play B.must be playing C.can play D. must have played 请选出答案,并说出具体的理由,谢谢.

Answer 1

第1题选B，这是表否定的推测，其它选项无此意义。
第2题选A，这是表有科学根据的陈述，一般将来时的用法的一种。
第3题选B，具体理由我说不出来了~语感~
第4题选B，因为前面有个at
the
moment,这里应该译为“在现在这个时候”，应该用进行时。(当然有的时候，at
the
moment
是“当时”的意思，那就不一定用进行时了，如:At
the
moment,Tom
had
just
been
fired，so...当时，汤姆刚刚被解雇，因此...)