在职申硕英语考试

【单选题】 Some of these studies (have shown) that although some people have trouble (to fall asleep), others have an (equally) difficult time (waking up).
A．have shown
B．to fall asleep
C．equally
D．waking up

网考网参考答案：B
网考网解析：
改为falling asleep，have trouble/difficulty (in) doing sth．类似结构还有It's no use (useless/pointless)doing sth．。 查看试题解析出处>>