问题补充：
—What a pity!
—Yes, I his not trying it, but in vain．
A. was suggesting
B. will suggest
C. would suggest
D. had suggested
答案：
A. was suggesting
B. will suggest
C. would suggest
(答案→)D. had suggested
解析：考查时态。根据句意可知这件事情是发生过的事情，而卧建议他不要尝试是在事情发生之前，所以使用过去完成时。
