Question

I am afraid I can not help you _____ ,I am too busy . A. just now B. just at present C.soon D then

Answer 1

I am afraid I can not help you _____ ,I am too busy .
A. just now B. just at present C.soon D then
选项是B
根据am afraid 和am too busy可知是【现在时态】， 因为just at present的意思是：“现在、此时”。

Answer 2

B. just at present 就在现在
因为后面的am说明是现在，不是过去或者将来。过去用was, 将来用will be。所以符合要求的只有B

我恐怕现在无法帮助你，我太忙了。