英语问题，进来吧

1.He didn’t come yesterday. He __C____busy working in the lab.

A. must be B. would have been C. must have been D. would be
句子的意思是：他昨天没来，一定再实验室里忙工作。表肯定的推测用must..., 因为是过去时，所以用must have been (一般现在时就用must be)

2.___B___he will come or not is unknown.
A. If B. Whether C. That D. What

Whether ...or not 是词组，不论与否的意思

3. The little village hasn’t changed much _____ a new road and two more stores.
A. except B. besides C. except that D. except for
句意是：除了一条新路和多出来两个小商店，这个小村庄没有大的改变。

个人认为应该填为“beside”,选项里没有，所以勉强选A，介词

beside是指路和商店是在改变的内容里的。except是指后面提到的内容不包括在里面的

.He didn’t come yesterday. He __C____busy working in the lab.

A. must be B. would have been C. must have been D. would be
句子的意思是：他昨天没来，一定再实验室里忙工作。表肯定的推测用must..., 因为是过去时，所以用must have been (一般现在时就用must be)

2.___B___he will come or not is unknown.
A. If B. Whether C. That D. What

Whether ...or not 是词组，不论与否的意思