作业帮英语 填入介词填入介词1.Can you be certain _______ the time of the meeting.2.There was no one in the streets ________ the policemen ______ duty.3.Now I have the key ______ the whole diffculty.
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英语 填入介词填入介词1.Can you be certain _______ the time of the meeting.2.There was no one in the streets ________ the policemen ______ duty.3.Now I have the key ______ the whole diffculty.
英语 填入介词
填入介词
1.Can you be certain _______ the time of the meeting.
2.There was no one in the streets ________ the policemen ______ duty.
3.Now I have the key ______ the whole diffculty.
英语 填入介词填入介词1.Can you be certain _______ the time of the meeting.2.There was no one in the streets ________ the policemen ______ duty.3.Now I have the key ______ the whole diffculty.
1.of
be certain of + n.对 很确定
2.except on
on duty执勤 固定搭配
3.to
key to (door,difficulty)固定搭配
类似的还有answer to question等
to
except on
to
of
except ;on
to
1,of 。 be certain of 后加名词，又确定的意思
2，except on 。 except除了 on 来搭配duty，守职的意思
3，to 。 the key to 有解决（问题）的方法的意思