The pen you are looking for is under th_爱下问搜题

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问题选择题

The pen you are looking for is under the desk.

A. who
B. whose
C. that

答案

答案：C

选择题

----I really don’t know when we can get over all the troubles.

---- ______! Our troubles will soon be over.

A．Forget it

B．Cheer up

C．Neither do I

D．What a pity

问答题简答题

肿瘤发生的内在因素有哪些？