问题

He gave us another piece of advice, ________ of great help to the research work.

A:which I think is
B:which I think it is
C:I think which is
D:I think it is

正确答案是：

同类题型

Excuse me. I _______ I was blocking(挡) your way.

mber of the people who canafford to buy their own house ______ more than 60%,but a number of houses _______.

who have regularphysical exercise seldom catch a disease like H1N1 Flu, ______

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How often does Tom play football— _______. He doesn’t like football.